What was found
FUEL LEAK IN NU 1 ENGINE NU ENGINE SHUT DOWN PER FM. OBSERVED 80 0LB IMBAL IN 30 MIN.30MIN DNCREW DE-BRIEF. ENG 1 SHUT DOWN WAS COMMANDED PER QRH FOR 800LBS LF TANK IN 30 MIN OR LESS. ENG SHUTDOWN TIME 0300Z . NO UPLIFT IN FF WHILE LEFT TANK WAS INDICIATION FUEL LOSS. ALL ENG PARAMAR TERS NORMAL, OIL PRESS, OIL QTY, VIBE LIMITS ALL WITHIN LIMITS. FUEL CONFIG DURING EVENT CENTER PUMPS-OFF . LT & RT PUMPS -ON , CROSSFEED CLOSED , APU OFF . PILOTS TRANSFERED FUEL TO BALANCE BEFORE LANDING. FOUND SIGNIFICANT FUEL POOLED INSIDE ENG COWL AFTER 20 MINS ENGINE RUN AT IDLE. IAW TASK 71-00-00-210-802-F00, STEP 3. FUEL OBSERVED AT RT VBV ACTUATOR DRAIN. SUSPECT RT SIDE VBV ACTUATOR. R & R RT VBV ACTUATOR ON E1 IAW AMM 75-32-02-000-802-F00 & 75-32-02-400-802-F00. INSTALL COMPLETED UP TO & INCLUDED H7. FINISHED INSTALLATION TESTS OF THE VBV AS REQUIRED, IAW AMM 75-32- MAINTENANCE PERFORMED SATISFACTORY. RTS