I have had a keyboard for a while and it has not given me any problems. However, recently, the middle C# on my Yamaha P-155 is sticky. It stays down until I lift it up. When I play the note again, it stays down. It also seems like it is leaning towards the left as well. I have tried pulling it up and moving it to the right, to reposition it, however, after playing it once or twice, it stays stuck down.

Because of lockdown, I am unable to take it to a repair shop. Are there any at-home ways of fixing this?

Thanks