This is how it looks now.
The screw size is M4. The one I used in the picture is 35mm long with a Phillips head. It is long enough to identify by feel and now I can remove the electronic part without putting my head inside the foot well.
The procedure is reversible. After the original screws are loosen enough for the bad part to come out, you can use a toy magnet to pull out the screw completely.
I will upload a picture of the magnet I used if anyone wants.
Concerns:
1. The old screws were tapered at the end. I may need to taper the new screws but I am leaving it as it is for now.
2. Should I or should I not use thread locking fluid.