I need to replace a few solenoids in my RAV4. The error code reads transmission solenoid problem. The car does not shift into first gear and always starts from second. First gear doesn't work, after replacing oil and flushing it, it worked for the time it took for me to drive it out of the garage, and then during the test drive again it stopped working. The transmission shifts perfectly, but just doesn't shift into first.

Can anybody give me a diagram of the solenoids in the transmission? How to replace them, And perhaps some hints on how to replace them? When I was replacing and flushing the oil I saw a couple of said solenoids behind a second plate. I was afraid to take it off because I thought that something might fall out. Does anybody have any experience replacing them?