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Originally Posted by 97E300D
Squirt a bit of oil into the problem cylinder and retest. A temporary rise in compression pressure will indicate worn rings. If there is no change, then valves are the most likely cause, then cracked rings, etc.......
Hope that helps a little.
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On a diesel I would squirt a bit of oil and then crank the engine with the combustion chamber open before doing a compression check. This will allow excess oil to be expelled but leave the cylinder coated with oil. There is a very small risk but a serious risk that the cylinder could fire or go hydraulic and do some damage if you squirt too much oil in the cylinder.