You can add a potential electrical short circuit to the list of safety risks that Boeing must address before regulators let the grounded 737 Max fly again.

The FAA recently asked Boeing to review the potential impact of all the changes it’s making to the plane. Boeing discovered that bundles of electrical wiring in the plane were too close together and might cause a short circuit that could cause a fire.

The company says it needs to do more analysis to determine if the wiring needs to be redone.