Thanks @fenugrec for some good input. I will checked the questions you have and came to the following conclusions,
1. Yes. the +55V and +150V rails are okay. I checked them all and none is below or above what would be normal.
2. The OP Amp is socketed so I lifted pin 567 out of the socket and run the scope. The temp of the IC was around +40C to +50C in that configuration.
3. I checked the voltage drop over R1240 = 0,62V so the current would be around 2.8mA.
4. All BJT's measure okay. I tested them all out of circuit.
5. Voltage drop over R1235 = 7,8V so the current would be around 115mA (0,9W).
6 Voltage drop over R1224 = 7,1V so the current would be around 104mA (0,7W). This is at the +12V rail.
R1235 is the resistor that is at >+102C. I didn't keep the scope on once I reached +102C because I worry it will fry. The resistor is rated 2W so it should be plenty of margin but ...the temp is worrying. It could perhaps be normal but I have no other COS6100 to compare with. It was also the -12V part of U1212 that didn't work before I changed it. It should have been regulated to around -12V but before changing U1212 the -12V rail was measuring around -22V.
When I said that the -12V was sticking out I actually meant temperature wize. If I compare temperatures of components in the +12V rail I can see that the -12V rail run much hotter. Perhaps something in the -12V rail draw abnormally high current but so far I have not been able to pin point anything. So the question is if this is normal or abnormal

Maybe bad design?!