What was found
CREW RECEIVED L PACK HI PRESS CAUTION MESSAGE AFTER TAKEOFF WITH RIGHT PACK ALREADY ON MEL. COMPLIED WITH QRH AND THE MESSAGE REMAINED. FLIGHT RETURNED TO IAD.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
CREW RECEIVED L PACK HI PRESS CAUTION MESSAGE AFTER TAKEOFF WITH RIGHT PACK ALREADY ON MEL. COMPLIED WITH QRH AND THE MESSAGE REMAINED. FLIGHT RETURNED TO IAD.