Gotta go PBR for sockets! Best price I've found so far.
Generally games older than 1970 I replace all the sockets. Between '70-'75 might get by with the tit/barrel solder trick if they look clean. After '75 most check out OK (but still need "the trick" just to be sure).
Bally EM's with those horrid flat staple-down sockets in the backbox always get redone with new ones. Which is verrry time consuming...