You might give Lippert customer service a call. Just Google "Schwintek slide out" and you will find the number. They have probably have seen your issue before and may have a solution or at least offer some insight. Other than that if you have tried everything you may have to take it to a shop. I understand the biggest problem is access to the motors and they may have a more drastic solution to the fix as to gaining access.
After you find the fix please let us know as it may help someone else.
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2009 Seville VF32KS
2019 GMC Sierra 3500HD Crew Cab Denali.
6.6 Diesel standard box.
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