My suggestion would be to bite the bullet and find an RV repair man who can come to your site and get your slides in and landing gear up. Then you can pull it to a RV repair shop that can fix what ails your Montana.
That is what I had to do when I was far from home and had a slide that wouldn't come in. I tried everything I could think of to get it in, but finally gave up and got a professional to do the job. I was back on the road the next day.
If I were you I would start by calling Keystone Customer service at
(866) 425-4369
They can probably give you some advice as to what to do. I think your unit is probably still under warranty.