What was found
DURING CLIMB OUT THROUGH 16,500 FT, PILOT REPORTED HEARING A POP ON F/O SIDE. IMMEDIATELY AFTER HEARING THE POP, A RUSH OF AIR WAS HEARD, WHICH CONTINUED THROUGHOUT THE REST OF THE FLIGHT. AFTER THE POP SOUND, THE ACFT PRESSURE BEGAN TO CLIMB TO APPROX 4500-5000 FT. DESCENDED TO 14,000 FT AND THE PRESSURE SYSTEM BEGAN TO LOWER THE CABIN ALTITUDE. R & R F/O'S WINDSHIELD IAW AMM 56-11-00. OPS CHECK PASSED IAW AMM 56-11-00. ACFT OK FOR CONTINUED SERVICE.