TM 10-3930-659-20 16-15.    HEATER VENTILATORS AND DUCT HOSES REPLACEMENT (Con't). FOLLOW-ON TASKS: • Install seat assembly and seat support (see paragraph 14-25). • Install cab rear panel (see paragraph 14-22). • Close cab fresh air filter door (see TM 10-3930-659-10). • Close right access door (see TM 10-3930-659-10). TA707015 16-55