What was found
LEFT FUEL GAUGE ERATTIC IN FLIGHT. WENT BLANK 3 TIMES. EICAS FUE L CONFIG SEVERAL TIMES.AS PER INBOUND FLT CREW ERRATIC DIPS IN L/H FUEL QTY OF 2500-3000 PNDS AND THEN FUEL L/H QTY BLANKING OUT, ALSO FUEL TEMP AND TOTAL FUEL QTY BLNAKED OUT CALCULATED FUEL BURN ON PROG PG REFLECTED FAULT. PEFORMED FQIS SYS TEST OPS CHECK GOOD AND NO PRESENT FAULTS. FLT LEG FAULT SHOWED LM TU 13 OPEN LOZ OR HIZ WIRE AO3, LM TU 6 CONTAMINATED AO9, LM TU 5 CONTAMINATED AO1, LM TU 3 CONTAMINATED AO3. FUEL QTY AND ALL INDICTIONS CAME BACK AT LOWER TANK FUEL QTY. FAULT HISTORY SHOWS LT TANK UNITS 13,6,5,3 WITH FAULTS. R & R LT MAIN TANK UNITS 13,6,5,3 IAW AMM 28 -41-01. OPS CHECKED GOOD IAW AMM 28-41-715-001-002.