I second the comment about the electrolytic caps. I have rebuilt three Vivitar timers and process controller power supplies, circa early 80's The caps dry out and go flaky. The other area of concern to look at are zener diodes, and thier pull down/pull up resistor. If the resistor at OEM time is too small, it will burn out and all sorts of wierd voltages then appear. I have replaced them with voltage regulators.