What was found
WHILE EN ROUTE TO PHL, THE CREW RECEIVED A DOORS LIGHT ON THE RED WARNING PANEL. THE CREW FOLLOWED THE QUICK REFERENCE HANDBOOK AND DIVERTED TO CREW. ONCE THE AIRCRAFT SLOWED TO 155 KNOTS AND DESCENDED DOWN TO 12,000 FEET THE INDICATION EXTINGUISHED. THE CREW CONTINUED TO CREW AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS THEN FERRIED TO PIT WHERE MAINTENANCE REPLACED THE DATA ACQUISITION UNIT IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 52-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.