Question : subquery returned more than 1 value: database vendor code 512

We have the sql view below that is returning error above. I've read references to repeating alias names for same tables and other citations for solutions. Can an expert help us troubleshoot? Thanks...

SELECT p.dob, pctc.patient_id, pctc.patient_assignment_id, dwect.doc_session_no AS dw_session#, de.doc_code, pctc.clinical_transaction_no,
LTRIM(RTRIM(p.lname)) + ', ' + LTRIM(RTRIM(p.fname)) + ' - ' + p.patient_id AS Patient, dwect.total_treatments, pctc.axis_I_II_1 AS CT_dx,
dwect.patient_dx AS DW_Dx,
(SELECT TOP (1) axis_I_II_1
FROM dbo.Patient_Clin_Tran_Cov AS pctc3 WITH (nolock)
WHERE (axis_I_II_1 IS NOT NULL) AND (protocol_id = '7934')) AS DX, de.created_date, dwect.modality, pctc.coverage_plan_id, pctc.proc_code,
pctc.proc_chron,
(SELECT TOP (1) proc_chron
FROM dbo.Patient_Clin_Tran_Cov AS pctc1 WITH (nolock)
WHERE (patient_id = pctc.patient_id) AND (episode_id = pctc.episode_id) AND (proc_chron < pctc.proc_chron) AND (proc_code LIKE 'ECT%') AND
(payor_payment > 0.00)
ORDER BY proc_chron DESC) AS Prev_tx,
(SELECT TOP (1) proc_chron
FROM dbo.Patient_Clin_Tran_Cov AS pctc WITH (nolock)
WHERE (p.patient_id = patient_id) AND (p.episode_id = episode_id) AND (protocol_id = '7934') AND (proc_code = 'MDEVLPSYDX') AND
(payor_payment > 0.00)) AS Consult_Date,
(SELECT TOP (1) proc_code
FROM dbo.Patient_Clin_Tran_Cov AS pctc WITH (nolock)
WHERE (p.patient_id = patient_id) AND (p.episode_id = episode_id) AND (protocol_id = '7934') AND (proc_code = 'MDEVLPSYDX') AND
(payor_payment > 0.00)) AS Consult_Code,
(SELECT TOP (1) billing_id
FROM dbo.Patient_Clin_Tran_Cov AS pctc WITH (nolock)
WHERE (p.patient_id = patient_id) AND (p.episode_id = episode_id) AND (protocol_id = '7934') AND (proc_code = 'MDEVLPSYDX') AND
(payor_payment > 0.00)) AS Consult_Id,
(SELECT LTRIM(RTRIM(s1.fname)) + ' ' + LTRIM(RTRIM(s1.lname)) + ', M.D.' AS Expr1
FROM dbo.Patient_Clin_Tran_Cov AS pctc1 WITH (nolock) INNER JOIN
dbo.Staff AS s1 ON pctc1.billing_id = s1.staff_id
WHERE (p.patient_id = pctc1.patient_id) AND (p.episode_id = pctc1.episode_id) AND (pctc1.protocol_id = '7934') AND
(pctc1.proc_code = 'MDEVLPSYDX') AND (s1.status = 'A') AND (pctc1.payor_payment > 0.00)) AS Consult_Name
FROM dbo.Patient_Clin_Tran_Cov AS pctc WITH (nolock) LEFT OUTER JOIN
dbo.Doc_Entity AS de WITH (nolock) ON pctc.clinical_transaction_no = de.clinical_transaction_no LEFT OUTER JOIN
dbo.doc_dw_wpic_ect AS dwect WITH (nolock) ON de.doc_session_no = dwect.doc_session_no AND
de.current_version_no = dwect.version_no INNER JOIN
dbo.Patient AS p WITH (nolock) ON pctc.patient_id = p.patient_id AND pctc.episode_id = p.episode_id INNER JOIN
dbo.Staff AS s WITH (nolock) ON pctc.billing_id = s.staff_id
WHERE pctc.patient_id = '00331154' and (de.doc_code IS NULL OR
de.doc_code = 'ECT') AND (pctc.payor_payment > 0.00) AND (pctc.proc_chron <= GETDATE()) AND (p.lname <> 'test')

Answer : subquery returned more than 1 value: database vendor code 512

Subselect in the SELECT clause must return only one row and only one column. The problem is at the last subselect which does not begin TOP(1). So you should check the following subselect or simply complete it with a TOP(1)

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(SELECT     LTRIM(RTRIM(s1.fname)) + ' ' + LTRIM(RTRIM(s1.lname)) + ', M.D.' AS Expr1
                            FROM          dbo.Patient_Clin_Tran_Cov AS pctc1 WITH (nolock) INNER JOIN
                                                   dbo.Staff AS s1 ON pctc1.billing_id = s1.staff_id
                            WHERE      (p.patient_id = pctc1.patient_id) AND (p.episode_id = pctc1.episode_id) AND (pctc1.protocol_id = '7934') AND 
                                                   (pctc1.proc_code = 'MDEVLPSYDX') AND (s1.status = 'A') AND (pctc1.payor_payment > 0.00)) AS Consult_Name