Hoses can crack of fall off, and on a 60, ya a whole bunch of them. Bolts can come loose, and gaskets can fall apart. Diaphragms can fail. I've been workin on old rigs for about 50 years, and I have seen a lot of "old age problems" pop up even on newer parts. When ya don't know what your lookin for, then ya gotta look at everything. Start with easy and cheap, then work up the list. Some symptoms dictate where you start, some don't. Sometimes identical symptoms do NOT have identical causes. Suggestions are just that, not solutions. Spend some time in the books, and spend some time under the hood, and hopefully you be able to cure it cheap and easy. John