As noted above, the log shows a few instances of short blackouts -- 5 seconds on the 28th of June and again on the 13th, and a 45 seconds later on the 13th. But these are NORMAL events ... transfer of power to battery and back to A/C is what a UPS does. Just how "smooth" these transitions are is a function of how good a UPS it is => I would hope you have a good unit (SmartUPS would be best), but in any event these shouldn't cause surges.
I don't see anything in the log that would support a damaging surge ==> as I said earlier, and Tom noted above, a surge will be "handled" by the UPS ... and if it's strong enough to do damage it will damage the UPS ... NOT the connected equipment. That's why APC (and others) offer their "connected equipment" warranties. Of course these don't apply if you have any bypasses -- such as the network connection. And unfortunately it's very difficult to say whether or not a voltage spike entered the PC via the network cable ==> a spike large enough to damage the add-in board would USUALLY also damage the network adapter ... but there's no guarantee of that.
Personally, I doubt the issue with the board is a spike ==> I'd wait and see what APC has to say about the returned unit. If a spike did indeed "get through" there should be evidence in the protection circuitry on the unit -- and if that's the case, APC will most likely pay for the damage to the equipment. If there's no such evidence, I suspect APC's position will be that IF there was surge damage, it came through the network adapter and not the UPS (which is, in fact, probably true).
But from what you've described, I doubt the problem with your board is due to a surge. Proving that is an entirely different matter. In the future, however, be sure to route ALL cables through your UPS :-)
