Peplink Balance 580 won't power on

This peplink balance 580 is 22 months old and out of warranty. It lost power at 8 am one morning - ran for about 6 hours after power was restored - then died.
I am wondering if anyone has every replaced the power supply on one of these boxes. Also- are there any “how to repair” electronic technical bulletins or manuals available.

Any help would be appreciated-