I had multiple issues, eventually had to punt:
The external amp failed. I was able to repair it by replacing the output stage ICs and capacitors that were all dried up.
The tape transport failed. I replaced the rubber belts as they had all stretched and gone brittle and it worked again.
The CD would not play more than a few seconds and then it would quit and eject. I tried realigning the transport tracking, and replacing the caps hoping they were just dried up, but that did not work. Concluded the transport was bad and I needed a new one, but couldn't locate one. Gave up, and put in a newer head from a 2002 Tacoma I think it was.