Boeing on Friday asked some operators of its 737 MAX jet to fix a potential production issue related to an electrical power system in the aircraft, prompting Southwest Airlines to remove 30 MAX jets from its schedule. Boeing said in a statement that it wants 16 of its customers to check and verify “that a sufficient ground path exists for a component of the electrical power system.” The 737 MAX returned to service in November after a 20-month safety ban that was triggered by two fatal crashes that killed 346 people. A Boeing spokeswoman said by email that this issue was not related to a key safety system called MCAS, which had led to the wider safety grounding. “We are working closely with the U.S. Federal Aviation Administration on this production issue,” the company said in a statement on Friday. “We are also informing our customers of specific tail numbers …