It is unlikely the plugs need changing at this point. You are welcome to do so, of course, but modern plugs can quite-easily go for the manufacturer's interval. (Your MM will tell you when it's time.)
The trans has a filter; it's bolted to the heat-exchanger housing inside the transmission. There is no defined change interval for it.
The trans has a filter; it's bolted to the heat-exchanger housing inside the transmission. There is no defined change interval for it.