As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE 101S WERE PREFORMING EMERGENCY LIGHT TEST ASSOCIATED WITH SLIDE CHANGE THEY GOT MSG EPSU INT LOAD EMER L. ALL LIGHTS ARE OPERATIONAL BUT DUE TO FAULT NEED NEW BATTERY R&R BATTERY FOR EMERGENCY LIGHTS PER AMM TASK 33-51-38 AND TEST PASSED