Theranos founder Elizabeth Holmes wants to force a key prosecution witness — who testified against her last year, then showed up at her home after her fraud conviction this year — to discuss his mental health as part of her bid for a new trial. Holmes, 38, has argued in U.S. District Court in San Jose that the August visit to her residence by former Theranos lab director Dr. Adam Rosendorff provided new evidence that compels Judge Edward Davila to throw out the jury’s January verdict. The jury found Holmes guilty on four felony counts of defrauding investors in her now-defunct Palo Alto blood-…