2002 Lexus RX300 Questions

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It Stays in neutral. It has 202,000 miles. Recently had the transmission fluids drained and refilled. Currently waiting to hear back from the mechanic shop.
while driving car started losing power . pulled over and it was overheating yemp gauge wasnt registering anything
My lexus RX300 transmission system is not selecting after working on the shaft.
shfter is hard to get out of park and into drive....
what causes the shifter to jam?
Have no brake lights!
i wrongly interchanged battery terminals
Transmission issue began about 2 wks ago on road trip (ie., car rapidly accelerated, gears wouldn't shift, and made slight squealing sound. Had it diagnosed & received codes P0770 & P765, I think. Moreover, I also received code P1135 but I believe that was for a O2 sensor, don't know if that's related. Anyways, the following day started car without problem but haven't tried to drive it since. In fact, I had car transported back home to be safe. Is it okay for me to try to add transmission fluid to see if this helps? Also what is the avg.cost of repair? I don't have a warranty so I'm trying to determine if the car's value is worth the cost of repair. In addition, I'm concerned if there will be more costly problems as a result of this major transmission issue. Please advise!!
While on my first roadtrip, post rebuilt tranny, I could feel a slight hesitation in speed. It's almost like the car had a hiccup. There are no warning lights on, I had my fluids checked before I left. I'm slightly concerned because we have a 600 mike return journey home today and it's just myself and my mom.
The audio is only working intermittently. It is getting power, and the fuses seem to be okay. The radio, cd, and tape players act like they work, but no sound comes out, not even crackles.
Also, possibly unrelated, but the back right door lock will not work with the power locks.
Any ideas on what what this might be, or how to fix it?
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