Hi, I am buying a norman grp ,it has been in the marina apparently unused for a couple of years, I went to see it last night and the engine, a diesel inboard ,was purring away, but noticed it had been jump started, as'' it had not been used for a couple of hours, but is charged up fine now''. the boat looks great handles fine, it has one leisure battery and one starter battery.What should I know before I proceed , if the engine needed to be jump started does that mean the batteries will need replacing if they have been left, anything else I should be looking at..Thanks sorry for my ignorance before i blow 9 k