As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: 4L DOOR CABIN PRESSURIZATION WARNING LIGHT IS ILLUMINATED IN FLIGHT AND ON GROUND. CABIN PRESSURIZATION DIFFERENTIAL IS ZERO (NORMAL) ON GROUND. REF: TSM 52-13-00-810-827-A, FOUND DOOR ASSIST BOTTLE AT 4L REQUIRED SERVICE. SERVICE BOTTLE IAW AMM 52-10-00-614-001. MESSAGE CLEARED.