As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED HYDRULIC FLUCTUATON AND QUANTITY DROP ON COMBINED SYSTEM DURING CRUISE, AIRCRAFT RETURNED FROM FLIGHT (FLT. #60616 KBAF-LFML), REFER TO TECH. LOG SEQ. #502658. ON GROUND CHECKED FOR HYDRAULIC LEAK. NIL FOUND. REPLACED COMBINED HYD. SYSTEM RESERVOIR QUANTITY TRANSMITTER IAW AMM 29-33-03. PERFORMED ADJUSTMENT AND TEST IAW AMM 29--01-00, ALL FOUND SATISFACTORY (SIN ON:0302A). MOR IS CONSIDERED CLOSED.