As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LIGHT PRODUCES AN ELECTRICAL ARC WHEN THE ATTACHMENT BOLT TOUCHES THE SCREW NEXT TO THE LIGHT ATTACHMENT SOCKET. MAINTENANCE REPLACED THE F/O LIGHT ASSEMBLY PER B717 AMM 33-16. THE OPERATIONAL CHECK WAS GOOD AND THERE WAS NO LONGER ANY ARCHING. (LP #6555658)