What was found
ON CAPT FMC THE EXEC LIGHT & THE OFFSET LIGHT FLASH BRIGHT THEN DIM AT APPROXIMATELY 1 TO 2 SECOND INTERVALS WHEN THE LIGHTS TEST SWITCH IS IN THE DIM POSITION. IN THE BRIGHT POSITION THE FMC LIGHTS OPERATE NORMAL, BRIGHT. AFTER 3 HRS OF FLIGHT THE LIGHTS STOPPED FLASHING BRIGHT/DIM BUT THEN REMAINED BRIGHT. WOULD NOT DIM AT ALL WITH THE LIGHTS SWITCH. ACFT GROUNDED. RESET ACFT EXT POWER. PERFORMED FMCS BITE REF FIM TASK 34-61, TASK 801. NO INFLT OR SENSORS FAULTS FOUND. ALSO EXEC KEY TESTS GOOD IAW FIM TASK 34-61, TASK 805.