As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE, CREW REPORTED LOUD AIR NOISE IN COCKPIT. NOISE WAS SO LOUD CREW COULD NOT HEAR. DESCENDED TO 10K AND CONTINUED UNPRESSURIZED. RESECURED AND RESEALED CAPTAIN'S EYEBROW WINDOW IAW DC-9 AMM. PRESSURIZED TO 4 PSID AND NO LEAKS NOTED.