Yamaha MX88 keys are noisy

I’ve gotten into my MX88 and replaced the felt a couple of times. Now, my keys are clacking and I’m also getting a strange noise when I depress A5. Does anyone have any tips for “unclacking” keys and analyzing/diagnosing for strange sounds? Thank you!

Hi- The only way to figure out the clacking noise is to pull the keyboard out and inspect it. If the noisy keys are in the center of the kb then it could be the ribbon cable touching the hammers. Or, it might be a hammer that popped out of its holder.