As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PAX CABIN CEILING PNL 227BLC EMERGENCY EXIT LIGHT DOES NOT ILLUMINATE-C/A-PERFORMED TROUBLESHOOTING OF EMERGENCY LIGHT PANELS NOT LIGHTING UP AND DETERMINED THAT THE POWER UNIT WAS NOT SUPPLYING REQUIRED POWER. REMOVED AND REPLACEDEMOERGENCY POWER SUPPLY REF E175 AMM 33-50-01 , PERFORMED OPS CHECK. OPS CHECK GOOD. EMERGENCY LIGHT ON PANEL 227BLC ILLUMINATES. NO FAULTS NOTED AT THIS TIME