MPT board monitors two separate 5v supplies (and 24v as well) . Check them at the board, not at the power supply. Set to 5.05 at board. Check the first one at TP1 and TP2 , and check the second one across the red varistor located near the top right corner of MPT board. Second one comes in via ribbon cable , so there is no other test point at the board. Also keep in mind voltage monitoring circuit sometimes goes bad on board itself resulting in unjustified shutdowns of microprocessor.
