Ahh, the blasted P1776...unfortunately, I'm all too familiar with that trouble code. I had bought a new valve body and solenoid pack (both from eBay IIRC) and had them installed in July 2013. Car drove great for 38,000 miles until I started experiencing some major trans slippage that gradually worsened over time until the car wouldn't shift past 2nd gear (maxed out at 36 MPH). Thought I was in limp mode but even after turning the engine off and re-starting the car, the issue still persisted. Needless to say, the trans had "tapped out" about 39,000 miles after the initial replacement.
I ended up having the transmission rebuilt right after New Year's Day this past January. First major repair on the car since I've had it (almost five years this May) and also the most expensive. The solenoid pack was also replaced again as "preventative maintenance" even though I still feel like 39,000 miles wasn't long enough to justify another replacement. Thought about installing a used trans but needed the car back fairly soon so just bit the bullet on the cost of the rebuild.
It turned out that the torque converter had an internal failure on one of the clutches, causing the car to stay stuck in 2nd. Upon inspection, it looked like a small chunk had been taken out of the circular ring. Really wish I had taken some pictures to show what happened. Don't ask how it happened because I was shocked myself. Needless to say, all is well now after the rebuild. Still can't believe how expensive it was but at least it came with a two-year warranty on both parts/labor.
Best of luck to you and I really hope everything goes well in the long run!
Thank you, Chrysler, for such a wonderful automobile.
Ride of the Month-February 2017-- President's Choice- Carlisle 2017