- 32 -15Duct unit removal.1. Remove the 7 screws (T3x8) and remove the Duct panel top.2. Remove the Spacer and remove the Themistor(TH902).3. Remove the FN904 and FN905.4. Remove the Duct panel bottom.Duct panel topDuct panel bottomSpacerThemistor(TH902)FN905FN904Mechanical disassemblies