What was found
AIRCRAFT WAS GROUNDED. AIR INTERRUPT, EMERGENCY NOT DECLARED, LANDING UNEVENTFUL. DURING CLIMB FUEL IMBALANCE DEVELOPED WITH NO FUEL BURN FROM RT WING TANK AND ALMOST NONE FROM CENTER TANK. LEFT CENTER BOOST PUMP WAS ON MEL DUE TO PREVIOUS DISCEPRANCY. ACCOMPLISHED FIM 28-22-00-810-801, SUBTASK 800-133. SUSPECT LT CENTER BOOST PUMP LOST PRIME. FUELED CENTER TANK, REINSTATED LT CENTER BOOST PUMP. ALL BOOST PUMPS CHECK GOOD IAW AMM 28-22-00 AND UFI SHOWS NOT FAULTS.