What coach do you have Frank?
I started
this thread in order to find and quiet my own alarm systems. As usual this forum has been a great help.
On my 2005 (Freightliner) the "Jacks Down Alarm" is a high pitched whistle. The noise module is located to the left (roadside) of the steering column and against the firewall about gauge high.
The combination "Low Air, "Brake Set with Coach in Gear" and "Parking Brake " noise buzzer module is hanging from a wire harness near the right side of steering column under the dash near where my right knee would be placed.
The Jacks Down alarm is considered "house electronics" and the rest is considered "chassis electronics" if you search for schematics.
Both are annoying but necessary so mine are getting wraps of electrical tape around them to quiet but not silence them. I located both yesterday and will be quieting them today.