What was found
PDIS 601 29-02 3869 24FEB22 HNL FACT U HYD 3 ELEV OFF LEVEL 1 APPROX 10 MINUTES AFTER TAKEOFF. HYD 3 LEVEL AT 4.0 AND DECREASING. THEN MOMENTARY HYD 3 OFF LEVEL 1 FOLLOWED BY HYD 3 FAIL LEVEL 2 WITH HYD 3 AT 0.0. COMPLIED WITH QRH, RETURNED TO LAND. FOUND SYS 3 HYD STAB TRIM MOTOR LEAKING. NOTIFIED MOCC. R/I 25FEB22 00:41 HNL U REASON CODE : PREMATURE REMOVAL/INSTALLATION OFF MPN: 418575 POS: 1 SRL: MX591742 TAG NBR: 4745B2 ON MPN: 418575 CPN: 2700160 SRL: MX239654 TAG NBR: 94A854 SHGN 25FEB22 00:41 HNL U R&R'ED HORZ STAB TRIM MOTOR #1 (HYD #3)PER MM 27-43-30-4, NEEDS OP'S AND LEAK CHECK FACT 25FEB22 01:32 HNL U PERFORMED LEAK AND OPS CHECK OF HORIZONTAL STAB TRIM MOTOR PER M.M. 27-43-30-4, ALL CHECK NORMAL, OK FOR SERVICE.