As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING OPERATIONAL TEST OF EMERGENCY LIGHT SYSTEM HAVE FAULT MESSAGE EPSU EXT. LOAD FWD L ON DISPLAY PANEL. TBSHT PER TSM NEED QUALIFICATIONS TO CONTINUE TBSHTING STEP 4B2. SUSPECT DOOR SLIDE. ACP SELF TEST ON FWD EPSU. EPSU SELF TEST FAULTS EXTERNAL LOADS. NEXT STEP IS TO USE TESTING TOOL TO FIND WHICH SLIDE IS AT FAULT. REPLACED DOOR 1R SLIDE, TESTS OKAY.