okay, the horn on my 740 stopped working. i removed both buttons, disassembled and cleaned them. upon reassembly they worked. but a week later this happened. it quit working and when i pulled the left button, nothing, dead. but when i pull the right button out, it works but ONLY when it is out of the steering wheel. when i snap the button back in it stops working. even when i remove the outer button cover and push the copper till it connects it is dead, but when i pull the thing out of the steering wheel and squeeze it, the horn works! meanwhile, the left button is totally dependent on what the right one does. any ideas on how to fix or where to look?