No release that I know of.

Another idea if you're crunched on time try unscrewing the gauge from the compression tester and feel it to determine if its filling up/emptying as it should of if something else is up..

If you don't have access to leak down tester, try just flooding the cylinder with compressed air while its at TDC and check throttle body/ pvc/ and exhaust side for air leak. you'll probably want to verify the exhaust and intake valves are working by rotating the engine with the air on..


So as I work over your problem I'm going back and forward with your cams and your valves being responsible. The more it sounds like a valve problem the more unrealistic i think it is that all five would go at the same time.