What was found
PDIS 638 21-01 2346581 07NOV20 PHL CLOSE. FOLLOWING A/I TEST IN FLT, F/A REPORTED RUSHING AIR NOISE FROM MIDDLE OF CABIN, BURNING SMELL NOTED SHORTLY AFTER. SHUT OFF PAC 1 AND NOISE AND SMELL DISAPATED. 36444 00 SMS FACT 07NOV20 09:53 PHL. R & R FLEX SLEEVE ON NR 1 AC PACK DUCT, IAW EMB 145 AMM 36-11-09-04. OPERATIONS CHECK GOOD, OK FOR SERVICE THIS TIME.