Swap that power cord if you must, but you are deluding yourself if you think that replacing 6 feet of power cord at the end of miles of power transmission grid and a pole step down transformer is going to make a difference. The only argument I can even imagine for this is that a certain power cord may filter RF interferrence to some extent, but equipment is generally aready pretty robust in this respect, and in any event a good power line filter will do a much better job.