Hi,   I'm hoping you guys can point me in the right direction. My 3-4 year-old Privia PX-150 had been turned off (and unplugged from mains) for a few months. I turned it on and started playing today, but noticed something very weird: when I play D2, D2# or E2 and hold the key down, I hear a loud clicking noise coming from the left channel in addition to the proper sound of the key.   Here's a video showing the problem (note that C2 is fine, it's only specifically D2, D2# and