What was found
DEN - DURING TAXI OUT, FUEL IMBALANCE OF 600 POUNDS NOTED WITH LEFT TANK HIGHER THEN THE RIGHT. DESELECTED MANUAL CROSS FLOW. AUTO CROSSFLOW DID NOT BEGIN. SELECTED MANUAL CROSSFLOW AND FUEL STARED TO TRANSFER IN THE WRONG DIRECTION. RESELECTED MANUAL CROSSFLOW AND IT TRANSFERRED CORRECTLY. AFTER TAKEOFF MANUAL WAS DESELECTED PER THE NORMAL CHECKLIST AND A FUEL IMBALANCE WAS NOTED WITH THE RIGHT WING 500 POUNDS HIGHER. CROSSFLOW CONTINUED UNTIL RIGHT WING WAS 100 POUNDS HEAVY. FUEL FLOWS WERE MATCHING BUT THE RIGHT WING WAS 210 POUNDS HEAVY WITH CROSSFLOW OFF. WHEN CROSSFLOW RESTARTED, FLOW WENT THE OTHER WAY. MAINTENANCE INTERROGATED THE MDC AND FOUND NO LISTED FAULTS OR HISTORY. PERFORMED A OPERATIO