As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4199, THE CREW REPORTED THE CALL LIGHT OVER SEAT 15 B & C IS INOPERATIVE. FOUND CALL BUTTON LIGHT BULB TO BE INSTALLED BACKWARDS. INSTALLED THE CORRECT WAY IAW AIRCRAFT STANDARD MAINTANANCE PRACTICES. OPS CHECKED GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.