What was found
LEFT TANK FUEL INBALANCE: MONITORED FUEL FROM SAN - FLL. NO IMBALANCE UNTIL CONFIGURING FOR LDG. ON LONG FINAL LEFT TANK FUEL IMBALANCE MSG ON LDG LFT TANK @ 3.2 RT TANK @ 4.4. DURING TAXI IN LFT TANK INDICATOR WENT BACK TO 4.4, WITH FUEL IMBALANCE MSG NO LONGER PRESENT. GROUNDED - YES. DURING INSPECTION OF #1 TANK QTY HARNESS CONNECTING ASSY FOUND FEED THROUGH CONNECTOR CONTAMINATED WITH FUEL REF B737-9 WDM 28-41-11 PG 3 SHT 4. R/H TANK RIB 5 FEED THRU CONNECTOR INSPECTED FOR CONTAMINATION, L/H WING RIB 5 FEED THRU CONNECTOR REPLACED ALONG WITH FQIS WIRE HARNESS REF EA M9-28EA-25233 & BOEING AGREEMENT # ASA-TA-2300676. #1 FUEL QUANTITY OPS NORMAL REF B737-9 AMM 28-41-00-710-801.