Jeep Liberty had been stalling when cold in morning. I thought it was belt tensioner wron out. Then gears slipped slighty when engaging, up slope from stop position. Then finally engine light came on. Now I can put into drive after about a minute of reving engine, it will go into drive but very difficult in reverse. Gears appear to work but I stopped driving car. Code P0868 and P0841 were identified by a mechanic. Is it the solenoid, torque converter or internal filter or other? fluid looks and smell good and was not below ADD line on dip stick but close