My MFJ-259b just started to read incorrectly.. Yesterday when I put a percision 50 ohm load it read R=50 X=0 1.0 SWR but now today it reads R=40 X=0 1.0 SWR Same load. Load is good. tried 3 more loads and all read R 39 to 40 and X=0 Open circuit read R=161 X=0 8.2 SWR I know thats wrong. Advanced mode load reads R011 S124 Z095 Open reads R200 S049 Z158 What could have happened? Any help would be greatly appreated.. PS this is all at 10MHZ

Thanks
Skip