What was found
ETOPS - FOB NOTED AT DEP 87.3 HOWEVER AT 4 HRS INTO FLIGHT 1200 LB UNACCOUNTED FOR. SUSPECT. FUEL LEAK ON RIGHT SIDE AS THE DIFFERENCE WOULD BE THERE. ENG BURNS MATCH AS WELL @ 6000LB/HR. REFERENCE TSM 28-26-00-810-832-A AND TSM 28-46-00-810-961-A. UNABLE TO FIND A LEAK ON LH OR RH INNER TANKS, #1 OR #2 ENGINES, OR CENTER FUEL TANK. QUANTITY INDICATIONS REMAIN STEADY ON GROUND. NOTED THAT FCMC 1 & FCMC 2 SHOWS A SLIGHT DIFFERENCE ON FOB LEVELS- FCMC 1 READING @ 61000 LBS (CONTINUED ON LOGPAGE 944512-2). AND FCMC 2 @ 59800 LBS. SWAPPED POSITIONS OF FCMC 1&2 PER AMM 28-51-34. FOUND FCMC 2 FOB INDICATION STILL READING LOWER THAN FCMC 1. FCMC POSITIONS REMAIN SWAPPED FOR TROUBLESHOOTING PURPOSES (NOTE: FCMC 1 SN: 550 AND FCMC 2 SN: 761). PERFORMED PRECAUTIONARY REPLACEMENT OF RH FUEL FLOW TRANSMITTER PER AMM 73-31-11. LEAK CHECK OKAY. OK FOR SERVICE