As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3847, CREW REPORTED GEAR DISAGREE WARNING WITH LANDING GEAR HANDLE UP NOSE INDICATED SAFE, BOTH MAINS DID NOT. AIRCRAFT REMOVED FROM SERVICE. REPLACED MPSEU PER MM 37-61-01. OPERATION CHECK GOOD SEE. AIRCRAFT RETURNED TO SERVICE.