What was found
CREW REPORTED ON TAXI, APU FAILED AND BURNING ODOR IN THE COCKPIT, AIRCRAFT WAS INSPECTED AND RELEASED IAW MEL 49-00-00 CATEGORY C-CONTROL 057571. IN RIC, REMOVED AND REPLACED APU STARTER/GENERATOR OPS CHECKED GOOD, NO DEFECTS NOTED, MEL ITEM CLEARED AND AIRCRAFT RETURNED TO SERVICE.