Need to replace tub seal, bearings and . . . entire transmission? (photo attached)

Hello,

My Kenmore stacked washer/dryer has been leaking from the bottom of the tub. It leaked mostly during the agitation and spin cycled and made a horrible high pitched squealing noise during the spin cycle. I had a technician take a look and he said that the tub seal was at fault and has corrupted the bearing. My boyfriend and I are not in a position to hire a technician to repair it so we’re going to see if we have enough combined torque to fix it ourselves. The technician told me that I would need a tub seal kit and new bearing. I’ve looked at a few instructions on the web and found that I’ll also need a spanner.

My worry right now is that the entire bottom part of the transmission is rusted. The technician didn’t actually see this; he just diagnosed the problem from when we saw the puddle on the ground and my description of the leak. Here is a picture of the inside of the machine. Will this rusty transmission need to be replaced entirely?

Thanks in advance, all.

Sorry, here is the picture that you may not have been able to access before.

Thanks again for any advice.