What was found
D; LEFT PACK FAIL MESSAGE. BURNING SMELL FROM PACK WHEN MX TRIED TO TURN ON. / C; MEL 21-51-0A / CAT: "C" DUE 10/22 / AT GATE READY TO PUSH, STARTED TO SMELL SOMETHING BURNING THEN GOT A PACK 1 FAIL. (FLIGHT #5704 FILED CLOSED) OCT 12, 2022 STATION: ORD--DEFERRED LEFT PACK PER ERJ 175 MEL 21-51-0A. NO MX ACTIONS REQUIRED. PLACARD INSTALLED. / WHEN ONBOARD THE A/C PACK ONE RESTARTED AND THE BURNING SMELL APPEARED AGAIN. CONFIRMED SMELL IS RELATED TO FAILURE OF PACK 1.