It may be fine, worth visibly checking the electrolytic for any signs of budging or venting, but its probably had very little use over the years. The .1uf is probably a mylar or some sort of film and should be fine, however check the schematic and see what it does incase it ties the case to the AC line, in which case replace it for safety. Only other thing worth checking is the resistors if they are carbons as they can drift a lot with age and heat. I have restored a few testers and vintage Heathkit equipment and been surprised how resilient old test equipment can be.
