If the motor doesn't smell like it's burning -or- it is not laboring due to too much air in the system, then I would try to jump the breaker to see if that is the source of the power interruption. I suspect that is the cause and it may be bad being so old now.
As for a leaking cylinder, I have one that is leaking too. I looked at the reproductions and they look dead on accurate i n shape. But, I may send mine out to get them resealed unless I can find the seals in a kit and do iot myself. I want to keep the original ones being that after so many years, one gets a sentimental attachment to the car plus its original parts.