As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: LOUD SQUEAL AT 16000 FEET FROM L2 WINDOW, RETURNED TO FIELD, EMERGENCY DECLARED. OVERWEIGHT LANDING AT 533400 RATE OF DESCENT AT TOUCHDOWN 500 FPM NLG TOUCHDOWN WAS FIRM. MAINTENANCE FOUND R2 WINDOW SEAL PARTIALLY OFF OF SEAL RETAINER. INSPECTED SEAL AND FOUND NO DAMAGE. INSTALLED SEAL IAW AMM56-11-13.