Yes, it was a "singer".
Just sad that I spend evening yesterday replacing caps, cleaning board, desoldering VFD DC-DC (ERG E705-E905VF) , soldering it back, as it's still a dud.
5VDC voltage is fine, reset is fine.
Here are some more photos during yesterday service:
I removed all parts around caps, tried clean PCB with acetone, and I thought silkscreen mask got dissolved by acetone. That never happen before.
Then tried some other area's of PCB with acetone, nop, silkscreen mask intact. So that was not acetone, but aggressive electrolyte from caps, evil enough to dissolve silkscreens and solder mask!
After replacement :
Did that because donor board had missing U622 GPIB chip and U621,U623 buffers and firmware PLCC32 ROM chip. Well, now I have those chips, desoldered them from my poor 7001 (again), and will use firmware ROM from problem board now.