Hi Eileen,
Yamaha's warranty for the 'EEA' (European Economic Area - which includes the UK, and will continue to do so after 'Brexit', should that happen!) for Genos and similar keyboard instruments is 24 months.
https://download.yamaha.com/files/tcm:39-627776#page=32Yamaha do have 'Warranty Extension Campaigns' for some products but currently there are none for Genos (or PSRs).
Any 'extended warranty' after 24 months for Genos in the UK is a dealers/suppliers warranty and is not supported by Yamaha's European arm, Yamaha Music Europe GmbH.
Although I would expect Yamaha as a company to still be around in two years time, you can't guarantee that all dealers/suppliers will be, especially in this economic climate. If a supplier goes bust, then their extended warranty is not worth anything!
Hopefully no-one will need to call upon Yamaha's or a dealer's warranty for any Yamaha keyboard since their keyboards tend to be (or at least used to be) quite reliable and well built, but are you really saying that the switch button assembly shown in the video appears to be good quality and likely to last! Only time will tell. I suppose that if you never use these buttons then they will last for ever!
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Personally I would much rather have the keyboard built to last many years (like they used to be) rather than have to rely on any warranty to cover Yamaha's penny pinching in manufacturing, but from what I saw of the switch assembly in the video, I doubt that they will last many years! Believe me, I would be happy to be proven wrong about this, but from what I have seen the button array does not appear to be designed with longevity in mind!
Chinese companies are well able to produce quality components if they are paid a suitable rate. People are quick to condemn China for the quality of their manufactured goods, but I suspect that more often that not, it is the customer who dictates the quality by the amount that they are prepared to pay!
Whilst I could easily replace these defective switch buttons (assuming that Yamaha UK would actually sell me the parts!), many owners would need to take the keyboard to a repair technician and pay their typically vastly over the top prices to get it fixed.
Yamaha seem to have problems with their software/firmware at the moment and I accept that such things can be notoriously difficult to even spot, but they must surely be able to foresee any hardware problems resulting from manufacturing penny pinching and preempt them by specifying better quality components, or at least exercise better quality assurance/control of them. After all we have paid 'top dollar' for the keyboard!
Maybe coming from a Tyros4 (which I still have, as well as the so-called upgrade product Genos) has elevated my expectations in Yamaha's build quality!
Regards
Ian