Roland JP 8000 - one key only responds when hard played

Hi



I´ve just bought a Roland JP 8000 in very good condition, but i has 1 (black) key that doesn´t work ;-(



Ok it works a little - meaning when i hit i hard it works, otherwise not. Has anyone an idea what i could be ?



Then the button for Bend Range does not give a normal click when pressed, but it works - is it easy to change og repair ?



I am greatful for your feedback



thanx

Roland JP 8000 - one key only responds when hard played