looking for tech support familiar with Accuphase in the San Francisco Bay area

sounds to me like something fried in the power supply section...

i would try rb electronics in redwood city or champlifier in alameda

both are quite competent hifi techs, long wait, not cheap, but they should be capable with accuphase stuff which i see as high grade non-exotic solid state amplification

perhaps ask the usa importer for accuphase who they have authorized as service and repair centers on the west coast?

I believe Nick Gowan at True Sound in Campbell is an authorized Accuphase tech.

@jjss49 @wrm57 Thank you following up with me, I appreciated! 

I switched my another amp in with same set up, and it did show warning message "Overcurrent" so I think it is the input impedance too low. guess I forget to match the dac, and amp after I upgraded my streaming DAC, finally it back to track, and works great again. 

Would anyone be interested in an informal Bay Area HiFi chat group? If yes, please message me and I'll add you.