Rubbers and felts loose their shape, keys break and hinges and weights can damage.  You need somebody who can get original parts and access to service manuals and drawings to ensure your repair is carried out professionally.
Yamaha, Korg and Roland Repairs & Service centre local

Most manufacturers offer support for spares and parts up to around 10 years old.  There are exceptions to some of the ‘flagship’ models however it’s a general rule of thumb that because of the many hundreds of unique plastic parts in a piano it would be uneconomical for a manufacture to hold every part forever, often with parts not interchangeable with other models!