A transmission service definitely helped with my 2-1 downshift although did not fully cure it but it is more than good enough to live with now. My battery light started to glow on idle when the alternator was on its way out, but would go out immediately if you upped the Revs anything from tick over. With the old alternator I regularly got the transmission failsafe warning as well as self level suspension inactive, but with a new alternator and decent battery everything is fine (for now ha!).