What was found
AIRCRAFT WAS GROUNDED: ON DEPARTURE PLASTIC / INSULATION SMELLED IN PASSENGER CABIN. DISSIPATED PASSING 10000 FEET. MAINTENANCE REPLACED THE 4 PASSENGER CABIN TRIM AIR MUFFLERS PER AMM 21-61-03. (FOR PARTS INFO SEE SDRS AALA202303178518, AALA202303179147, AALA202303177902, AALA202303178924)