As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE/SMELL - PILOTS REPORTED THAT WITH THE BATTERY ON, ALL OF THE ANNUNCIATORS REMAINED ILLUMINATED WITH A SLIGHT BURNING SMELL BEING NOTICED. MX REMOVED AND CLEANED THE MICRO SWITCHES ON THE PUSH TO TEST SWITCH. THE OPS CHECK WAS GOOD. REF MM 33-10-00.