As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CIDS SYS TEST FAILED DUE TO DOOR 1L SLIDE REPLACEMENT AND RE-INSTALLATION. BATTERY FAULT ON EPSU AT DOOR 1L. REPLACED BATTERY, NO HELP. SWAPPED EPSU FROM CENTER RIGHT AND PROBLEM FOLLOWED. SUSPECT BAD PART FROM STOCK. REPLACED EPSU BACK AT CENTER RIGHT. REPLACED EPSU WITH ANOTHER UNIT. PASSED TEST.