As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ABOUT 5 MINUTES AFTER ENGINE START CABIN WAS NOT COOLING DOWN. WE SWITCHED TO MAX COOLING FROM THE APU. ABOUT 30 MINUTES LATER 3 OF 4 FLIGHT ATTENDANT AND SOME PASSENGERS COMPLAINED OF SMELLING FUMES AND ASLIGHT HEADACHE. IT WAS MOSTLY AT THE REAR OF THE CABIN. (OPEN).