TM 9-2320-209-34-1 CHAPTER 15 TRANSMISSION SYSTEM TROUBLESHOOTING 15-1. EQUIPMENT ITEMS COVERED. This chapter gives equipment troubleshooting procedures for the transmission system , for which there are authorized corrective maintenance tasks at the direct support and general support maintenance level. 15-2. EQUIPMENT ITEMS NOT COVERED. All equipment items for which corrective maintenance is authorized at the direct support and general support maintenance level are covered in this chapter. 15-1