That's a real possibility. I wonder if a flush might loosed a stuck piston? There should be a reverse pressure test port. Possibly remove and load with Kroil followed by pressure from a rubber tipped blow gun and 120 psi. Just throwing a few ideas out. But the reality is that even if it did start to work, that little sailor on your shoulder would be constantly reminding you "it could happen again".
1983 Present 42 Sundeck
Twin Lehman 135's
✌️