As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING L2 SLIDE CHANGE EMERGENCY POWER SUPPLY UNIT TEST FAILED (EXIT AND INT LOAD FORWARD LEFT). TROUBLE SHOT PER TSM 33-51-00-810-808A. (EXIT FAULT) CLEANED BREAK-AWAY CONNECTOR INTEGRAL TO R1 SLIDE. FAULT CLEARED.