As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1678 - TPA-DCA - EMERGENCY EQUIPMENT - DOOR 1L ON TAKEOFF ROLL, THE "RED" CABIN PRESSURE LIGHT & DOOR SLIDE UNARMED BEGAN FLASHING. AT CRUISE, ALL WENT BACK TO NORMAL. ON DESCENT, CABIN PRESSURE LIGHT & DOOR SLIDE NOT ARMED STARTED FLASHING. FOUND RAFT LANYARD INTERFERING WITH GIRT BAR ON AFT END. REPOSITIONED LANYARD. OPERATIONAL CHECK OF THE ARMING LEVER WAS GOOD.