As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PWM/DCA - FLT 234 - ON CLIMB-OUT, THE LEFT SLIDING WINDOW WAS MAKING A LOT OF NOISE. FLIGHT RETURNED TO PWM WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE LEFT SLIDING WINDOW OFF TRACK. THEY REINSTALLED THE WINDOW PER AMM 56-13-00-400-814. (X)