Your 834AV44.138 is indeed part of the Dometic 8300 series. You can replace the torsion assembly with compatible parts from other 8300 series awnings, or temporarily repair the lever with universal awning hardware while sourcing OEM parts.
Small awning tears under 6 inches respond well to repair tape for 1-2 seasons. Multiple tears or brittle fabric means replacement is more cost-effective. Fabric-only replacement costs 200-400 dollars if frame is intact.
Atwood safety sensors need tank contact. Replace deteriorated foam with high-temp material, position sensors firmly against tank. If unit is old with multiple issues, consider replacement.
RecPro faux leather furniture commonly experiences flaking and seam separation within 3-5 years even with light use. DIY repair options include vinyl repair kits and re-sewing seams, but replacement with higher-quality furniture often provides better long-term value.