My TF has been 'mohawking' lately. I thought my wife was maybe rushing it through, or the 'mulch plug' was drooping, or there was an issue with taller bermuda....I tried it and it is definitely the mower. Looked underneath and more sections of the plastic deck have broken/worn away. I have decided to retire it. I am gonna get a 17" for my wife to use. It is also plastic-decked and lightweight. perhaps more maneuverable - not sure if it has a brushless motor????
Mike, if I get a chance, I may pull some parts out of the mower. problem is, we are in the middle of major remodeling and 90% of my stuff (including tools) is packed away. If you're interested in the control board or other parts, maybe they would be available for cost of shipping. Might not get them to you in time for this summer's season......
Sorry to hear that your Twin Force is falling apart, but I'd definitely recommend that you do NOT buy the 17" model. It is positively awful in so many ways. The height adjustment system is a nightmare, very difficult to use and it's maximum adjustment height is only 3-1/8", which is 1/4" less than the twin force. Yes, I know that Greenworks claims the the maximum cutting height is 3-3/8", but they are incorrect. And no, it does not have a brushless motor. Mine is very poor quality and flimsy. The front left wheel was bent inwards almost hitting the deck, and I had to completely remove the front axle to bend it back in my bench vise. There was a bad vibration that I could even feel in the handlebar and it is almost as loud as a gas mower. I haven't even used mine for several years, and am seriously thinking about just throwing it away to free up garage space.
Frankly, the quality of the newer Greenworks plastic deck mowers is much lower than the original models. You might be better off buying the older 16" model, which is still available although not as tool only.
As to my twin force, I really don't use it any more, favoring my 60 volt 21" Greenworks push mower, which cuts much better than the twin force with it's heavy duty blade and faster blade tip speed. I just bought a new Greenworks 60 volt 8 Ah battery that can easily mow my entire yard with the mower running 100% of the time in turbo mode. I use my old first generation Greenworks 40 volt 16" mower to vacuum leaves in the fall and winter, and use the little 13" WORX to mow in landscaped areas that are inaccessible to my larger mowers. This spring I discarded two old 24 volt SLA battery mowers and gave a third small one to neighbor for his 4-1/2 year old son to help daddy mow the lawn. So, thanks for the offer on the parts from your Twin Force, but I really don't have any need for them.