As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AFTER PUSH FLIGHT ATTENDANT CALLED SAYING HAD MESSAGE L1 DOOR LOW PRESSURE, DOOR SHOWED ARMED ON EICAS! RETURNED TO GATE. REPLACED L1 DOOR ASSIST BOTTLE DIAPHRAGM AND ACCOMPLISHED A SATISFACTORY LEAK / OPERATIONAL CHECK PER AMM 52-10-00.