How to repair dead keys (C#/D & G/G# on all octaves) on Yamaha p125

I’ve searched the internet for a solution to my dead keys on the Yamaha p-125 that I purchased less than a year ago.

Each time I press the keys C# than D; D is dead. Same with G than G#. G is dead. This happens on all the octaves. The keys are dead only when pressed in that sequence, otherwise the keys function well on their own.

I’ve tried resetting the keyboard to its original factory setting pressing and holding down the last key (to the right) and turning on the keyboard but did not solve the problem.

If the circuit boards are the problem, can you suggestion what circuit boards I need to purchase?

Your assistance will be greatly appreciated.