What was found
AFTER T/O NR 1 FUEL QTY INDICATOR BLANKED. SOON AFTER TOTAL FOB INDICATOR BLANKED. BOTH SOON CAME BACK BUT NR 1 TANK WAS 400 - 500 LBS LESS THAN IT HAD INDICATED PRIOR TO T/O. AS WE LEVELED AT ATTITUDE. NR 1 TANK INCREASED BY ABOUT 500 LBS AND INDICATES WHAT IT DID PRIOR TO T/O. IN CRUISE APPEARS TO INDICATE NORMAL NOW. VERIFIED NO CURRENT FAULTS. LAST FAULT (28 41108) WAS 7 FLTS AGO NO FAULTS SINCE. ACCOMP GROUND TEST, TEST PASS. CHECKED FOR WATER IN NR 1 TANK NO WATER FOUND. TRANSFERRED FUEL FROM NR 2 TO NR 1 AND BACK AGAIN. RE-ACCOMP GROUND TEST, TEST PASS. REF FIM 28 41 00 810 807.