[SiriusHardware]

Although there is quite a lot already working on your machine, there is a standard approach to servicing, which starts with

- A visual examination to see whether there is anything obviously physically wrong (burnt or blown up components, damaged tracks, loose wires or connectors, etc). Since you've already gone over the PCB to clean it I would say that you have effectively already carried out this step, and presumably found nothing which leaps out.

- Next step is to carry out basic checks on all the supply voltages. Although the behaviour of the machine does suggest that the supply voltages are in the right ball park area, you should never assume so because a supply voltage off or out by more than a certain amount can cause some very odd behaviour so it's always worth taking a short time to verify these voltages.

Could you please measure the DC voltages on the component leads indicated on the attached sketch? In case it's not clear from the diagram, we are asking for measurements on the right hand ends of diodes CR10, CR11, CR12 and on the lowest lead of regulator VR6. If you need somewhere to put the black probe while making these measurements, the -Ve (right hand) end of C62, the large electrolytic with the cable tie around it, is connected to 0V.