What was found
DTW - WHILE LEVEL AT CRUISE THE 'YAW DAMP OFF' LIGHT ILLUMINATED FOR APPROX 5 MINUTES AND BOTH FMA'S SHOWED VERTICAL SPEED AND NO AUTOLAND (PREV SHOWED ALT HOLD) THIS WAS ON DFGC NR 1, SWITCHED TO DFGC NR 2 AND PROBLEM REMAINED, AFTER SEVERAL MINUTES SWITCHED BACK TO DFGC NR 1 LIGHT STAYED ON UNTIL NOSE (YAW) TRIM WAS ADJUSTED SLIGHTLY LEFT AND RIGHT THIS ALL OCCURRED WHETHER AUTOPILOT WAS ON OR OFF NO ADVERSE YAW OF AIRCRAFT WAS EVER FELT QRH REF. REMOVED AND REPLACED DUAL LATERAL ACCELEROMETER PER MD80 MM 22-19-02. SYSTEM OPS CHECK (RTS) PER MD80 MM 22-01-05. OPS CHECK GOOD. (M)