I'll add something here.
On sunday I powered up my A600 for the first time in 9 months and I smelt something funny, like a leaking battery. As I had replaced the clock battery last year, I knew it could not be that.
Audio was scratchy. I opened the unit and woe and behold, a 22uF electrolytic, C303 near the Audio filter had leaked. There was some black goo on the PCB which I removed with PCB cleaner.
My dead CD32 supplied a replacement part and it works fine now.