What was found
(CAN) AFTER LANDING ELECTRICAL SHORT/ARCING BEHIND CAPTAINS SEAT IN CIRCUIT BREAKER PANEL. SOME SMOKE OBSERVED. AC TAXIED CLEAR OF ACTIVE RUNWAY. SMOKE AND SPARKS STOPPED, AIRCRAFT TAXIED TO RAMP, PRIOR TO ARRIVAL AT GATE SPARKS RE-OCCURRED. AIRCRAFT STOPPED AND DEPLANED. MAINTENANCE INSPECTION FOUND BUSS FEEDER JUMPER WIRE DISCONNECTED AND HAD MADE CONTACT WITH BULKHEAD BEHIND CB PANEL. ARCING DAMAGE BURNED THROUGH STRINGER AND BULKHEAD SKIN. BULKHEAD BURN THROUGH APPROX 1 INCH BY .5 INCH . (2) FEEDER WIRES BURNED INSULATION. FEEDER WIRES PA204D8 AND PA204E8 REPLACED. WIRE PA204C8 CONNECTION FOUND LOOSE AT CB 1-H2, ALL SCREWS ON BUS BAR H FROM H2 TO H13 FOUND NOT TIGHT. SB601R-34-096 (PROVISIONAL GPS INSTALLAT