What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS SHORTLY AFTER TAKEOFF CADC DATA FAIL MESSAGE WITH LOSS OF DFGC DISPLAYS. RETURNED TO DFW. CB C17 DIGITAL FLIGHT GUIDANCE SYSTEM - SWITCH A FOUND OPEN. MAINTENANCE REMOVED AND REPLACED #1 AND #2 DFGCS IAW AMM 22-01-01. ACCOMPLISHED ALL REQUIRED TESTS IAW AMM 22-01-02. ACCOMPLISHED ALL REQUIRED TESTS, OPS CHECKS GOOD IAW WDM 22-16-11. MAINTENANCE ALSO REPLACED THE FLIGHT GUIDANCE CONTROL PANEL IAW AMM. MAINTENANCE ALSO FOUND WIRE 1C610X20RD FOR T20-6 ELEV POSITION SENSOR LEFT SHORTED TO STRUCTURE IN TAIL COMP L/H SIDE O/B OF LEFT HEAT EXCHANGER COOLING FAN. REPAIRED WIRE IAW SWPM 20-10-02, WDM 22-16-11 PG1 SH 3. (SEE SDR # AALA201907239043, AALA201907239044, AALA201907239045)