As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER DEPARTURE, THE CAPT CONTACTED MTC TO ADVISE THAT THERE WAS A NOISE COMING FROM THE LT AREA OF THE FLT DECK. AFTER TALKING TO MAINTENANCE, IT WAS DECIDED TO HAVE THE ACFT RETURN TO BASE. AFTER RETURN, THE CAPTAIN`S SIDE WINDOW WAS REPLACED. LEAK AND FUNCTION CHECKS WERE PERFORMED IAW THE APPLICABLE AMM.