2003 Z71 Dropping Transmission Pan

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I have an 03 Silverado K1500 Z71. It recently turned 100k miles, so I decided to change the transmission oil/filter. The problem is to get the pan off their is the shift cable bracket in the way. It is mounted to the transmission with 2 T40 torx head screws. They are siezed pretty well. Using a 3/8 drive ratchet wouldn't budge them. Yesterday I sprayed PB Blaster (the best I could) just to start soaking them, hoping over time they would free that way.

Any advice? Have you ever run into this issue?