As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TAKEOFF WAS ABORTED AT 50 KTS DUE TO LOUD WHINE IN THE COCKPIT. COCKPIT TEMPERATURE WAS 85 DEGREES, WITH LEFT AIR CYCLE MACHINE MALFUNCTION. PLACARDED LEFT PACK INOPERABLE PER MEL 21-51-1. REPAIRED LEFT AIR CYCLE MACHINE PER MM 21-51-03, P. 201 IN BOS, SYSTEM CHECKED NORMAL.