As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: WHILE ACCOMPLISHING R1 SLIDE CHANGE THE OPERATIONAL TEST OF EMERGENCY LIGHTING SYSTEM. FAILED CIDS FAULTS EMERGENCY POWER SUPPLY UNIT INT LOAD EXIT R AND L. OCCURRED. **SUPPLEMENTAL REPORT WILL BE SUBMITTED** (OPEN)