As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE INTERIOR PREFLIGHT CHECK OF THE EMER LIGHTS WITH THE SWITCH IN THE ON POSITION THE LIGHTS DID NOT COME ON. WE RAN THE 25X CHARGING PROCEDURE TWICE AS PER MAINTENICE BUT THEY ARE STILL NOT WORKING. CORRECTIVE ACTION: SWAPPED BATTERY PACK POSITIONS. OPS CHECK GOOD. IAW CE700 MM 33-50-07