As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT ATTENDANT REPORTED CABIN PSI LIGHT ILLUMINATED AT DOOR 2L. AIRCRAFT WAS PRESSURIZED. SLIDE AT DOOR 2L ALSO DISPATCHED UNARMED. AIR RETURNED TO PHL. UPON ARRIVAL-FOUND 2L DOOR ARMING LEVER WOULD NOT GO FLUSH IN "ARM". FOUND GALLEY CART SECURITY SEAL IN FORWARD GIRT FLOOR FITTING. REMOVED SEAL-2L DOOR OPERATIONS CHECK.