96 SLS, 80,000 miles, 4 new tires and redone front end. Now the transmission is not shifting and whinning. When it does shift, it goes through all gears. One code PC0717 history and sometimes current - been having for past 2 years. Car is in great shape overall. Need to decide if I should fix and keep, fix and sell or just sell as is. Any idea regarding cost to fix or replace transmission. Also any input regarding cars market value fixed or broken. Bringing to trans shop on Monday or Tuesday. Recommended by 2 different friends bih mechanics.