OBDII code reads P0441, P0446, P0455, P0766, & P0766 P codes for 2006 Toyota Camry -

Question

Hi, I finally bought a diagnostic tool scanner and the above codes showed up. I've been told I need a new transmission in March but my car still runs fine. I've had my solenoid replaced twice. Last in 2011. Each time the engine light turns on a week or two later. Each time The mechanics couldn't find anything wrong.I also recently had my transmission fluid flushed. Can anyone tell me what's going on?

Thank you