As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ELECTRICAL SMELL IN CABIN CONSISTENTLY AT LAVATORY AT 2L, NOTICED AT LAVATORY 3L & AROUND ROWS 25 - 27. ACCOMPLISHED AMM 05-51-50, TO STEP C T. FOUND A BURNED SOCKET ON THE MIRROR LIGHT FIXTURE AT DOOR 2L, ISOLATED LIGHT BALLAST FROM THE SOCKET. ALSO USED FIM 21-00-TASK 808. NO FURTHER SOURCES FOUND.