What was found
DFW - CREW REPORTED ON CLIMBOUT C17 DIGITAL GUIDANCE COMPUTER CIRCUIT BREAKER POPPED. TOTAL LOSS OF DIGITAL FLIGHT GUIDANCE SYSTEM, 1 AND 2 YAW DAMPER, MACH TRIM, AUTO THROTTLE AND AUTO PILOT. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND 1C610R20RD WIRE TO LEFT ELEVATOR POSITION SENSOR IN AFT TAIL COMPARTMENT CHAFED. REPAIRED WIRE. SYSTEM GROUND CHECK NORMAL OPERATION.