Some reporting:
It's really apparent by now that when the caps go bad, a lot of things may happen. The LA I'm working on didn't got a power surge (ie. did NOT die suddenly from over voltage, which could be really apparent in such large damages), it just gradually started having problems with disc (CD) playback -> in the end didn't play anymore disc whether CD or LD, just tried to do so...
Found out so far:
Several more or less leaked caps from various boards.
2.2k resistor in power supply transformed itself to something like 195K (causing the -5V line to be something else...)
Audio demodulator toasted (apparently due to -5V failure)
2x burned fuses on service board
What is remarkable is that none of the fuses in power supply went out. So, the supply kept feeding the system even while caps were leaking and voltage levels were incorrect.
After changing caps, 2.2K resistor and two fuses:
Laser led functionality looks correct (moves up/down again)
LD and CD are again detected correctly
Disc spins to apparently good speed (after parts change it didn't spin correctly before I made some tuning to potentiometer sitting on the laser led ribbon cable)
However, laserdisc playback seems to be not working yet. The Play-button led keeps flashing, not constantly lit as it should be in normal situation.
Now waiting for service remote, service LD and part shipment to get the audio chip etc.