As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. AFTER REPLACEMENT OF L4 SLIDE PER JOBCARD 26L00025010, STEP 7 OF JOB CARD WOULD NOT PASS TEST. MAINTENANCE REPLACED FORWARD LEFTHAND UNIT POWER SUPPLY PER AMM 33-51-38 AND PERFORMED SATISFACTORY OPERATIONAL CHECK.