What was found
AIRCRAFT WAS GNDED. DURING PAX BOARDING, EXTERNAL POWER WAS DISCONNECTED. APU OVER TEMP WITH BOTH PACKS OPERATING. SHUT OFF LT PACK. AFTER 10 MINUTES RT PACK SHOWED FLOW LOSS. SHUTOFF RT PACK & RESTARTED LT PACK. A BURNING SMELL & SMOKE REPORTED IN CABIN. APU, BOTH PACKS & RECIRCULATION FAN SHUTOFF. PAXS DEPLANED. MAINTENANCE FOUND LEFT GROUND COOLING FAN AND CONNECTOR P1-173 BURNED. REMOVED AND REPLACED COOLING FAN IAW AMM 21-20-06 AND CONNECTOR IAW SWPM 20-31-00, WDM 21-22-00 AND EA 259619. SEE ALSO AALA20160411002. SUPPLEMENTAL (CLOSED)