Wanted to weigh in on this without going into "rant mode"!!!
It pains me that our society has become so "disposable commodity" minded. Many (not all thankfully...) "dealers" don't want to work on anything more than a few years old - whether its a car, a tractor, a motor, home appliance, etc. They would rather replace it with a new disposable model - one not often built as well as the one you want fixed. - I had a washing machine that lasted through 3 families and over 25 years that was replaced by a piece of @#$@$% that fell apart in less than 5!!!!!
I'm sad that we, as consumers let this happen! In theory, we "control" the market with our wallet. When it comes to GT's, I don't buy the new crap and would prefer to refurbish something older and built to last. But in some other areas, I guess I'm just as guilty as most. Buying quality is hard to do or too expensive to accomplish some times. I buy quality tools, I use them a lot. But we have a Harbor Freight in our town - they do a bang up business selling cheap tools and such. A HF ratchet costs a couple bucks, vs up to $60 or so for a good SnapOn or Mac. And I'm SURE it wont last as long as the top shelf one, but hard to justify the added expense to a guy who only uses the thing once a month for little stuff.
But if you don't work on your own stuff, there are fewer "repairmen" out there who know how and are willing to take on business. No offense intended to anyone in the trade, but we mostly have "parts changers" instead of "mechanics" anymore. Anything more than replacing a couple parts is "unrepairable" or "not worth the cost of repair" and you are steered to the new sales area! There was a time when you were EXPECTED to take care of your own stuff. For example, in the OWNERS (not service!) manual for an old Gravely L model, it explains how to deal with a sticking valve! Now we have a JiffyLube on every corner because most people can't change their own car's oil
Ok.... Stop... Take a breath...... Sorry Guys!!!
Sorry if I stepped on anybody's toes here....
As to the OP - if it is fixable, it probably is something pretty simple or pretty major - not likely in the middle ground. If simple, get a few basic tools and do-it-yourself. You MAY find a new hobby that you enjoy! Questions and "how do I do this" stuff can be found/answered here - I think these guys could walk you through just about any repair, with pictures! Wrenching is not rocket science, it's basically simple stuff. If it's major, it may be beyond what you can/want to deal with, but transaxles are not too difficult to switch out if you take a mind to it....
Worst you are going to do is make a broken machine (an "unfixable one" I might add) more broke! But if you fix it......
If your machine is toast (that's a mechanic's term BTW, smile...), don't go buy new, go find an older machine IN GOOD SHAPE, that will last. The older stuff is more durable, lasts longer and was made with fixing in mind! Depending on your needs, a Deere 110, 300, Ford LGT, Cub Cadet, or any number of good solid models built in the 70's - 90's can be had much cheaper than the quoted new prices. And when needed, you can do 90% of the repairs yourself with basic tools.
Best of luck!!!!!