What was found
CLIMBING THROUGH FL260 LOST ALL AUTO FLIGHT PARAMETERS, F/O ALT WAS 300 FT OFF, NO ALTITUDE ALERT. PASS THROUGH 250 DESCENT EVERYTHING STARTED TO COME BACK BUT WOULDN’T STAY ON, NO C/B`S POPPED, NO ANNUNCIATORS. AIR RETURN BACK TO DTA, AIRCRAFT TAIL SWAP WITH N804NK. REMOVED AND REPLACED NR 2 CADC. OPS CHECK GOOD. RTS AND AUTOLAND CHECKS OK. (M)