What was found
FUEL IMBALANCE WHILE IN LEVEL FLIGHT FUEL QTY READS 1540/11880/40/8860/1560 WITH FOB 23300. ATTEMPTED TO FOLLOW QRH 120.9 & 120.6 WITH THE CROSS FEED VALVE NO HELP. FUEL IMBALANCE CONTINUED TO INCREASE ON THE LEFT WING. CFR INDICATES LEFT PUMP 2 LO PR MESSAGE. REPORTED BY CREW TOMC SMITH DO NOT HAVE A FLSCU IN STOCK IN ATL NOR SPECIALIZED EQUIPMENT FOR TESTING PER PARAGRAGH 4A OF THE TSM 28-46-00-810-810A. ACCOMPLISHED FUEL TRANSFER PER TSM 28-23-00-810-803-A. NO UPDATED PARTS FOR AC 4703 UPDATED SENSOR PART. UNCOMMANDED TRANSFER NOTED AT THIS TIME. OPERATIONAL CHECK GOOD. THERE WAS A L UNFULL SENSOR 26QJ1 MESSAGE FOUND UPON CHECKING POST FLGHT REPORT AND PERFORMING TSM TASK 28-46-00-810-810A WE ADD ACP''D TSM 28-46-00-810-810-A FOR L UNDERFULL LEVEL SENSOR 3 IDLE RUN WITH NO ABNORMAL FUEL TRANSFER INDICATED, AND POST ENG 26QJ1. PER STEP 4(A)6 - REPLACED FLSCU POS 1 (7QJ) PER AMM RUN POST FLT GOOD, CFDS COMMAND FLSS BITE CHECKS GOOD, NO 28-46-34-000-001 & 28-46-34-400-001-A, FUNCTIONAL TESTS GOOD. FAULTS. SET NEW FLT NUMBER, RESET FADECS, RAN BOTH MOTORS FOR 10 MIN ROTABLE PARTS CHANGE WAS INDICATED - TT # 1071328 SN OFF 3446 IPC REFERENCE # 28-46-34 UNIT, FUEL LEVL OFF 31-2840-9-9001 3446 ON 31-2840-9-9001 1852