As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: SLIDE COVER AT DOOR 4L UNABLE TO INSTALL AFTER SUCCESSFULLY PERFORMED FUNCTIONAL CHECK OF DOOR EMERGENCY POWER ASSIST SYSTEM CIRCUITRY OF WORK CARD NUMBER 72C80052002. SUSPECT ESCAPE SLIDE PACK ASSEMBLY ISSUE. INSTALLED NEW 4L ESCAPE SLIDE (AALA202109153517) AND BUSTLE COVER PER MCM CARD 25-94-25.