It's your valve seals. Pretty easy to change out. Disconnect your quick connect hose from your compression tester, screw in a plug hole and attach an air hose on the other end. The air will force the piston down & hold the valves up. Easy on the air pressure though. Use A small clamp type valve spring compressor, compress the spring then remove the two keepers & remove the spring. Off with the old valve seal on with the new. Back on with the spring, then the keepers (little dab of grease on keepers will hold them in place), make sure they seat correctly. Remove the spring compressor and lightly tap the top of the valve stem to insure the keepers are in place. Don't remove the plugs from all the cylinders as you do this, one at a time then replace as the air will spin the motor over.
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