Diagnose a CD player problem please.
It's a Sony Discman D20 from the late 80s. Takes a little while to 'warm up'. Won't read the disc on the first few tries, and when it does it plays with small skips for about a minutes or so. After that it plays perfectly. Happens on new and old discs, and isn't track dependant.
Have cleaned the optics with IPA once. I know it's old, happy to have a go at fixing myself.