I finally got one to go with my PL-112D and SX-450 and they are all 1976!
It supposedly had a wonky meter, but they both work fine from what I have observed.(Seller Ebay pic)
What I did:
I already adjusted the speed and cleaned the heads.
I spotted a part that I need to resolder.
The meter in the picture no longer does that, it works perfectly fine now.
The Automatic Stop function does not work.
I know I need to deoxit some stuff, I just haven't done it yet
Now what other kind of maintenance do I need to do?
Do I need to lube/oil any parts (ie; the motor)?
Do I need to replace the belts?
Is there an actual Service Manual for it(I already have the Owner's Manual and Schematic)?
Anything else I should worry about and work on(outside of a recap)?
How do I fix the Auto Stop function?
Thanks for any help!