The ifixit repair guides are good to look into possibilities; locate the right one.
https://www.ifixit.com/Device/Mac_Laptop
PowerBookmedic.com has parts and says they repair stuff. Never tried them.
Another by name wegenermedia.com has repaired portable Macs for decades.
These likely have or can get nearly any parts. Some kinds of parts may still be
available from owc macsales.com, such as replacement drives, RAM, batteries.
Even the logic boards may be repaired. However the cost value may be exceeded
by some percentage if several things may need to be replaced, if unit were restored.
Other companies may actually quote a fair rate if they still work on vintage gear.
Those who specialize tend to repair computers for business, education, or other
and may be able to provide extensive service. Depends on what you want to do.
Good luck in this matter! 🙂