557: capacitors.
Short on +5V !!! => 0.1uF ceramics capacitor short.
Bad soldering between PCB and transformers.
On side P0550A-0A++++ACA one channel: bad AD652JP.
Programming the new one AT28HC64B rev 0P
2631: High deviation:
ch_5: 65400
ch_6: 65535
ch_7: 64894
ch_8: 65014
Regulated.