TM 9-2320-209-20-3-4 d. Replacement. FRAME 1 1. Using rag, wipe surface clean around mounting hole for transmission breather (1) in transmission housing cover (2). 2. Using 7/16-inch wrench, screw in transmission breather (1). NOTE Follow-on Maintenance Action Required: Replace intermediate tunnel. Refer to Part 3, para 18-5. END OF TASK 23-110