As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPT REPORTED LANDING GEAR DISAGREE MSG WHEN RETRACTING GEAR. PLANE ARRIVED IN EWR WITH LEFT GEAR DOOR DOWN. T/S PER SSM 32-30-01-101, VERIFIED THAT SYSTEM OPERATES ON GROUN D WITHOUT ANY NOTED ELETRICAL DEFECTS. OPENED AND CLOSED MLG DOO RS SEVERAL TIMES WITHOUT ANY C/B''S TRIPPING. SUSPECT PREVIOUSLY INSTALLED L MLG SAFETY VALVE BAD FROM STOCK. SAFETY VALVE AND PACKING IN FWD GALLEY. REMOVED AND REPLACED V649 LH MLG SAFETY VALVE REF AMM 32-35-10 OPS CHECKED MLG DOORS NO DEFECTS NOTED AT THIS TIME