131,000 miles. Wouldn't shift up from 1st gear or engage into reverse. The day before it did the same but I unhooked the battery for a few minutes, reconnected, and then it shifted fine. Acted up again Day 2, but battery disconnect didn't cure it. Towed it to dealer and their master technician diagnosed an internal module failure in the tranny. Said it can't be fixed and can only be remedied by a new transmission. For a mere $6000. A highly regarded local private transmission shop quoted the same. Too many miles to put that much into her. Just last month trade-in value was under $3000. Any suggestions for repairs, or just put on the market for sale as-is? Thanks.