What was found
CAPT SLIDING WINDOW LOCK MECHANISM BOUND UP. HIGH PITCHED SQUEAL EMANATING FROM AFT PART OF F-O SLIDING WINDOW. LUBED OVER CENTER MECHANISM. CLN'D TRACK, ALSO CLEANED WINDOW SEAL AND AREA. REMOVED SOME HARD STUFF FROM SEAL. ADJUSTED CAPT NR 2 WINDOW PER MM, ADJUSTED AFT AND FWD VERTICAL ROLLERS AND LINK ARM INBOARD. PRESSURIZED ACFT, WINDOW UNLATCHES NORMAL. EXCESSIVE NOISE AND AIRFLOW IN THE COCKPIT INTERFERING WITH COCKPIT COMMUNICATIONS. CLEANED DUCTS ABOVE COCKPIT WINDOW 1L AND 2R. OPS OKAY.