Yamaha Clavinova CVP-305 WB822300 TG1 Circuit board

I am trying to locate and purchase the circuit board WB822300 TG1 board for my Yamaha Clavinova CVP-305 digital piano. On the board says “YAMAHA #2790” and “X4411 TG1”. I have tested my piano with a loaned WB822300 board and the test confirms mine is faulty.
Can anyone please tell me where I can purchase that part?
Thank you.

This can be purchased from Yamaha. Part # is WB822300. $757.86 USD.