I'm considering rebuilding the tranny on my daughters '05 A-4 2.0 Quatro. All solenoids work but engine code suggested slippage in 5/6 gear causes the tranny to go into a safe mode. Any advice out there? Iím seeing comments about a range selector, magnets in the shifter and water under the passenger carpet. Also, regarding the tranny fluid, other than the dealer is there a known substitute? I canít seem to find the right fluid readily available at auto stores.