t.amp tsa 1400 (channel knob not working)

Amplifier with a non-functional B channel knob (the actual amp works fine)I know someone out there can fix it, but I don't have the time or knowledge to do so. I can also sell it with the case. Specifications: - 2x 670 W at 4 Ohm - 2x 450 W at 8 Ohm - 2x 800 W at 2 Ohm - 1x 1380 W bridged at 8 Ohm - 1x 1600 W bridged at 4 Ohm - XLR input and output - Speaker twist output - Protected circuit design with audio limiter, temperature protection, and short circuit protection - Dimensions: 484 x 350 x 97 mm - 19" / 2 RU - Weight: 10.4 kg I am open to offers. Collection is preferred, but I can deliver locally for a fee.