What was found
LEFT CENTER PUMP LOW PRESSURE LIGHT ILLUMINATED WHEN TURNED ON AT CRUISE ALT. GROUNDED - YES. REVERSED CONFIGURATION CHANGES OF MEL 28-22-02A, CONFIRMED CIRCUIT BREAKER DOES NOT TRIP AND GFI R54 IS NOT TRIPPED. PUMP OPERATES BUT DOES NOT SOUND GOOD AND LOW PRESSURE LIGHT EXTINGUISHES. CONTINUED B737-9 IFIM 28-22-00-810-808, GVI OF CONNECTOR D802 AND WIRING NO DEFECTS NOTED. 115 VAC PRESENT AT D802. REMOVED AND REPLACED LH CENTER FUEL BOOST PUMP REF B737-9 AMM 28-22-41-400-801. PERFORMED OPS AND LEAK CHECK FOR L/H CENTER BOOST PUMP GOOD.