What was found
ENGINEERING REQUEST DUE TO RECENT FUEL IMBALANCE ISSUE, CHECK #1 (LEFT) FUEL TANK UNIT VALUES GROUNDED - YES. COMPLIED WITH STEPS 1, 2, 3, 4. OPERATIONAL TEST GOOD PER B737-800 AMM 28-41-00-710-801. FUEL MEASURING STICK COMPARISON GOOD PER AMM 28-41-00-720-801. PERFORMED SYSTEM TEST CAPACITANCE CHECK AND FOUND COMPENSATOR AND PROBES 1, 2, 4, 5, 6, 7, 8, BAD. WILL REQUIRE REPLACEMENT. OPENED MIG 2C S/N 40-0027519, 40-0027520, AND 40-0027521. REMOVED AND REPLACED COMPENSATOR, FUEL PROBES #1, 2, 4, 5, 6, 7, &8 REF AMM 28-41-21-400-801.