As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR RETURN: AT LIFT OFF, HEARD A LOUD BANG AND AIRCRAFT WOULD NOT PRESSURIZE. NO DOOR LIGHTS OBSERVED. RETURNED TO DEPARTURE. SECURED E&E BAY DOOR. PRESSURIZED AIRCRAFT OPERATIONAL CHECKS GOOD. E&E DOOR WARNING LIGHT INDICATION INOPERATIVE. REPAIRED BROKEN WIRE AFT OF E&E DOOR SWITCH. OPERATIONAL CHECK GOOD. (K)