Need feedback from Mopar dealer service techs on Fiat era Chargers

Family member has a 2011 with the 3.6, engine is very quite good on gas burns/leaks
nowhere at 100K. Trans good but has to downshift a lot on hilly roads which says not enough torque its weight/power. Some minor computer issues, trunk sometimes opens by itself!? Info screen will blank out for a day or so then return. Typical brake
warping and caliper sticking (most newer cars with caged calipers).