As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: FIRST OFFICERS SLIDING WINDOW HAS THE RELEASE KNOB MISSING FROM DOOR MECHANISM. REPLACED F/O SLIDING WINDOW RELEASE KNOB FOR RELEASE MECHANISM AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 56-11-01.