The only way to remove the dropped screw is to dissemble the HVAC housing. start by draining the coolant and discharging the A/C system. Here is a video that can help with the A/C recharge:
https://youtu.be/4EqdrBVb0sY
Here are the instructions in the images below and how to remove and disassemble the unit. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Friday, March 24th, 2023 AT 6:28 PM