Do the poor mans flush or just change the fluid and filter. Transmission flushes can knock a bunch of gung lose and cause problems. Most shops dont do it anymore. i did the poor mans flush on my 06 with 60k. Just drain the pan unhook the lower hose if i remember corectl,start it, put it in neutral and poor fluid in until new fluid starts coming out. I think it took me 2 quarts to see fresh fluid. Only use nissan or eqivilant fluid. Idemitsu makes the fluid for nissan and it is relativaly cheaper if you want to go that route.