As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISCREPANCY: REFERENCE LOG PAGE LP402170 AIRCRAFT WAS NOT GROUNDED WAS IN FOR SCHEDULED MX ON CHECK OF EPSU FOUND SEVERAL FAULTS FOLLOWING THE TEST (ESCAPE SLIDE, EXIT SIGNS, CROSS ISLE AND BATTERY) RECOMMEND CHANGING BATTERY. PARTS ON ORDER. CORRECTIVE ACTION: EPSU (10WL) BATTERY FAILED TEST. R&R EPSU (10WL) BATTERY OPS CHECK GOOD. REFERENCE AMM 33-51-00-710-001./END/