As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VERY LOUD SQUEEL CLIMBING THROUGH 9000 RETURNED TO IAD DURING INITIAL EVALUATION FOUND CAPTS P5 CONDENSATION DRAIN TUBE DISPLACED AND CAUSING RH #2 SLIDING WINDOW SEAL TO NOT MAKE CONTACT FOR A PROPER SEAL. RESECURED CAPTS DRAIN TUBE, AND ACP CABIN PRESSURIZATION REF AMM TASK 05-51-91-790-801, NO SQUEALING OR LEAKAGE NOTED.