As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT MOST CEILING EMER LIGHT INOP. PERFORMED POWER CHECK ON AFT CEILING PANEL IAW CMM 25-28-63. FOUND NO POWER ON J3 PIN 5. FOUND CONNECTORS P5461 AND P5459 SWAPPED. INSTALLED P5461 AND P5459 IN THERE CORRECT POSITIONS IAW CRJ 900 AMM 25-26-05 OPS CHECK GOOD.