What was found
PDIS 912 29-02 3898 10AUG22 TLV OPEN U LOGPAGES:3336064 UPON REACHING CRUISE FL380 THE '' R HYD QTY'' MESSAGE APPEARED R QTY WAS APPROX 0.48 AND DECREASING. COMPLIED WITH QRH AND CONSULTED GOC. DECLARED EMERGENCY WITH ATC AND RETURNED TO TLV. AMM27-41-05-2 FOUND RH STCM LEAKING. REMOVED AND REPLACED RH STCM AS PER AMM 27-41-05-2. ALL TESTS PASSED. PERFORMED INSPECTION PER 29-11-00-2 TABLE201 , CONDITION 1 (PRESSURE AND CASE DRAIN MODULE FILTER DIFFERENTIAL PRESS INDICATORS) WITH NO FINDINGS. SERVICED RH HYD SYS PER AMM 12-12-01-3.