4x2 V6 3.7L Jeep Grand Cherokee Laredo bought it leaking tranny fluid then more problems came up

When I bought the jeep it was low on transmission fluid, so I filled it up and then discovered it was leaking, at first I thought it was a bad fluid pan gasket so I bought the filter kit and replaced the filter and the gasket, after I drove it after that fix, the tranny stopped shifting normally and the rpm would get real high, it leaked the fluid again, so I dug around and found it to be Common transmission leak on many Chrysler products which is the electrical plug housing so I bought it and replaced it, the tranny wouldn't shift right still and now it goes into neutral after the 3rd or fourth gear. The "professionals" at aamco said it was a bad solenoid and charged me 300 dollars to replace it and then take back out saying it wasn't the problem. The check engine light came out a long time ago so I took it to auto zone and got these codes all of them pertaining to the tcm p0700 p0730 p1731 can you help me please? I hope its an easy fix~!