Helping buddy fix his boat. It's a 94 OMC. The trim works fine up/down and no leaks. But it will bleed off, even after 10 minutes it's noticable. We checked at a local shop and they said the rams were leaking. Had rams rebuilt for $200 and it did not help. Is there a hidden check valve somewhere that needs to be repaired?? Just looking for other options before throwing more $$$ away.