My Massey 5610 has developed a problem . On the factory fit loader joystick u can change up and down power shifts as well as the standard t bar and shuttle lever but now it won’t change down shifts only upon the loader control. Press the downshift and goes up shift. T bar and shuttle lever works shifts fine . It’s all started after I cleaned cab out . Hosepipe on cab floor and wiped everything else down certainly not soaking wet so think it has something to do with it. Also a warning buzzer intermittently on as if the handbrake on or something.