As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
"C HYD QTY" DURING FLIGHT. HAPPENED IN CRUISE AT FL340. FLUCTUATED DOWN TO .08 DURING DESCEN. PARKED AT GATE WITH .26 UPON FURTHER TROUBLESHOOTING, FOUND O-RING CUT UNDER AILERON ACTUATOR CHECK VALVE ACCESS PLUG. REMOVED RT I/B ACTUATOR TO FOM REF. 27-11-20-2. REPLACED O-RING AND SAFETIED ACCESS PLUG. INSTALLED RT I/B AILERON ACTUATOR UP TO STEP H. (1) (A) REF. 27-11-20-2.