What was found
CLIMBED OUT AT 220 KNOTS UNTIL 10000 THEN ACCELERATED TO 260 KNOTS FELT CONTINUOUS VIBRATION AND DETERMINED ONLY GEAR DOOR WAS DOWN. AFTER 45 MINUTES GEAR DOOR RETRACTED AND EICAS MESSAGES WENT AWAY CONTINUED TO KCVG AT 260 FOR CAUTION. AIRCRAFT HAS BEEN IN A CHECK AND WAS RELEASED 4/9/2026. REF NR-15 PER CUSTOMER REQUEST CHANGE LT UP LINE GEAR POSITIONER FUSE. ALL OPS CHECKS GOOD. IAW AMM 32-32-19-404-007. AIRCRAFT REMAINS NO ETOPS. AIRCRAFT RETURNED TO SERVICE.