As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SPARKS COMING FROM THE APU START & STOP PANEL ON OVERHEAD. REMOVED ALL POWER FROM AIRCRAFT, NO ARCING AT THIS TIME. NO FUMES OR ODORS NOTED. APU WAS RUNNING AND APU GENERATOR WAS ON. R & R THE APU POWER & FUEL AND START/STOP SWITCHES IAW ESPM 24-00. OPS CHECKED GOOD. INSPECTED PANEL, NO EVIDENCE OF DAMAGE NOTED.