As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHT CHECK WILL NOT PASS. GIVES MESSAGE - EPSU UNIT FWD L. REPLACED LEFT FWD EPSU 10WL AND NEW SLIDE. NO HELP. CONTINUING TO TROUBLESHOOT. T/S FOUND 1 RT AND 1 LT SLIDE BAD VERIFIED BY 2 DUMMY PLUGS. SLIDES REMOVED & REPLACED.