As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE, THE FLT CREW REPORTED THEY PUSHED THE P A BUTTON ON THE OVERHEAD AND SPARKS CAME FROM THE SWITCH ASSY. CAPT RECEIVED A SHOCK. MAINTENANCE FOUND THE SWITCH ASSY LOOSE IN THE PANEL. SYSTEM CHECKED NORMAL AFTER TIGHTENING THE SWITCH ASSY.