What was found
AIRCRAFT WAS GROUNDED: SHORTLY AFTER MAINTENANCE SIGNED OFF THE BUS 2 212XP CB POPPED OUT AGAIN. ELECTRICAL ZAP WAS HEARD IN THE REAR CABIN GALLEY. SPLICED A NEW SECTION OF WIRES 2456-1000RBY, 2442-6507RBY, 2443-6000,2461-6000 AND 2451-6000 PER ESPM 20-53-21, 20-53-29, 20-48-11 AND 20-43-11. PUSHED CB 212XP BUS 2 BACK IN. OPERATIONAL CHECK GOOD AT THIS TIME. ALSO SEE AALA202104269058 FOR ASSOCIATED ISSUE.