Case 580SL II parking brake alarm

Hello to all,
I've searched the forum considerably looking for an answer, but can't find one, so I thought I'd ask for some help here.
I have a Case 580SL II that recently began sounding an alarm when I put it in gear (as in clicking the shuttle shift into F or R). It had done this occasionally in the past if the parking brake was not FULLY pressed down in the released position. Now, it does it all the time. It does not sound this alarm in neutral, and if in gear, the alarm will go off if...

Case 580SL II parking brake alarm

Case 580SL II parking brake alarm