What was found
FLT 992 - GUM - AIR RETURN DUE TO FIRSTI OFFICER ADI INOPERATIVE, DOES NOT RESPOND IN ROLL AND DOES NOT INDICATE A BANK. MAINTENANCE TROUBLESHOOT SYSTEM FOUND FAULTY WIRES. FOUND WIRES NR 27 AND NR 28 GROUNDING OUT AT VG CANNON PLUG. RESPLICED WIRES IAW WDM 34-22-03 PAGE 901. PERFORMED MANUAL VG 'ROLL', FO'S ADI CHECKS GOOD. AIRCRAFT BACK IN SERVICE. (M)