What was found
AIRCRAFT NOT GROUNDED: PILOT REPORTS ONE CENTER TANK FUEL BOOST PUMP *USABLE* WITH ALL FUEL PUMPS ON, CROSSFEED CLOSED, AND FUEL IN THE CENTER TANK, FUEL FED FROM THE RIGHT TANK. AFTER FUELING LEFT AND RIGHT TANK,8.6, CENTER TANK 10.5. DURING FLIGHT, RIGHT TANK DECREASED TO 7.8, WHILE LEFT TANK REMAINED AT 8.6. AFTER CENTER TANK WAS EMPTY, INBALANCE BETWEEN LEFT AND RIGHT TANK REMAINED THE SAME AND DID NOT INCREASE. MAITENANCE REMOVED AND REPLACED THE RH CENTER BOOST PUMP IAW AMM 28-22-41. LEAK CHECK GOOD. OPS CHECK GOOD.