Fixing up Pioneer PL-115 Belt Drive TT

Greetings,
I recently picked up a used Pioneer PL-115 TT. Suggestions on things to clean up and improve? I plan on replacing the belt. It currently has a Pioneer headshell. Suggestions for replacing the cartridge? Does this TT need feet? If so, any recommendations?

When I tested out the TT last night, I found that the pitch of instruments/voice would intermittently sag just a little. Ideas on how to fix?

Thanks in advance for any suggestions.