As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SVC CHECK FOUND EXTERIOR AFT LIGHT FAULT DURING EPSU TEST. REMOVED ORIGINAL SLIDE 4L TO T/S FAULT IAW AMDS WORK CARD 2561-4001-LA,. OK TO INSTALL ORIGINAL SLIDE. REINSTALLED ORIGINAL DOOR SLIDE 4L IAW AMDS WORK CARD 2561-4001-LA. (LP 8620310 - AIRCRAFT WAS GROUNDED)