I am a forklift technician here in Pennsylvannia, and if the regulator has a blown diaphram it needs to come apart,only thing is the shop has no drivers for the special tamperproof screws,all the other techs just use a pin punch or chisel to knock the screw loose then replace it with a regular screw.

There is a reason that they are tamper proof. Take it apart and you just lost your EPA/CARB compliance possibly resulting in a large fine.