As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT APROX 15000, 6.0 DIFF, CABIN 1000 FEET VERY VERY LOUD SQUEAL, MAYBE FROM R1 WINDOW, VERY DIFFICULT TO COMMUNICATE I CONTROL CABIN AND WITH ATC. DURING DESCENT SQUEAL CONTINUED UNTIL BELOW 5000 FEET AND 2.4 PSI. MM21-31-00 PRESSURIZED THE A/C UP TO 7.0 FOUND NO LEAK. FWD LAV SMOKE DETECTOR WENT OFF, MAKING A VERY LOUD NOISES. REMOVED/REPLACED SMOKED DETECTOR MM26-14-00. RE-PRESSURIZED UP TO 7.0 NO DEFECT NOTED. A/C OK TO CONT.