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259 B3 Bent final drive mounting frame, track derailing

Hello Everyone, Wondering if anyone can help me out here. I have a 259 B3 skid steer that has a problem with one track constantly coming off. We have taken the tracks and sprockets off. We found the final drive with the track that constantly derails is tilted down 1 inch. The other side tilted down 1/4 inch. I found out that there was a correction for this in Service letter REHS5411. Plates are designed to be welded on to the frame to strengthen it to prevent bending. It looks like this was done to my machine but after it was already bent. It looks like ithe frame was not staightened first. 

Does anyone have any experience with this problem?

Any help would be greatly appreciated.