Vehicle will not shift manually! The code that came up was P0715, P0730

Most likely you have problem with "conductor plate" that is causing transmission computer to put your transmission in "Limp" mode - only one gear forward (3rd) and reverse. Conductor plate has integrated speed sensors, one of them is defective. Usually replacing conductor plate takes care of both error codes (P0730 indicated incorrect gear ratio - in simple words "slipping" and may be result of no speed signal from speed sensors) if there is no mechanical damage inside.