What was found
AIRCRAFT WAS GROUNDED: WHILE PERFORMING EMERGENCY POWER SUPPLY UNIT SYSTEM TEST, EMERGENCY POWER SUPPLY UNIT (13WL) AFT LEFT DID NOT PASS TEST. REPLACED SLIDE PER JOB CARD # 26L000025010.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIRCRAFT WAS GROUNDED: WHILE PERFORMING EMERGENCY POWER SUPPLY UNIT SYSTEM TEST, EMERGENCY POWER SUPPLY UNIT (13WL) AFT LEFT DID NOT PASS TEST. REPLACED SLIDE PER JOB CARD # 26L000025010.