As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GNDED. OPERATIONAL TEST OF ESCAPE FACILITY FAILED. PERFORM BITE TEST IAW TASK 33-51-00-810-806, FOUND EMER POWER SUPPLY UNITS 11WL & 12WL FAULTING. REPLACED BATTERIES IAW AMM 33-51-38-000-01. SATISFACTORY OPERATIONAL CHECK ACCOMPLISHED IAW 33-51-38. SEE AALA 201603169005 FOR 12WL PART INFORMATION.