As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX - EN ROUTE FROM PHX TO LAX, CREW REPORTED THE FIRST OFFICER'S VOR/DME SWITCH WAS INOPERATIVE. WHEN SWITCH WAS PUSHED, A POP WAS HEARD AND A SMELL OF FUMES WAS NOTED. MAINTENANCE FOUND DEFECTIVE LAMP IN SWITCH BUTTON. REPLACED LAMP. TEST/OPS CHECK GOOD. REF TASK 34-51-02-032-001.