What was found
ON SHORT FINAL, AN APPARENT STATIC DISCHARGE OCCURED BY THE L-1 DOOR. A SHOWER OF SPARKS CAME FROM THE WALK-AROUND O2 BOTTLE MOUNTED ON THE BULKHEAD. F/A-S ON JUMPSEAT WITNESSED LARGE DISPLAY OF SPARKS AS WELL AS PASSENGERS FIVE ROWS BACK. FOUND TERMINAL SPLICE TO 115V AC SERVICE OUTLET SHORTING. C/B POPPED PER NORMAL OPERATION. RESPLICED WIRE, RESET C/B AND OPERATION CKS OK.