As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS - FLT 4397 - AFTER TAKEOFF, THE CREW HEARD A LOUD SQUEAL. AIRCRAFT RETURNED TO BOS AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND FUSELAGE RAIN GUARD SEAL HAD PULLED LOOSE. SEAL WAS REINSTALLED AND AIRCRAFT RETURNED TO SERVICE. (M)