Problem with resin tank


Good evening.
I have been using a zortrax inkspire almost 2 years.
Now the problem is that I cannot change the Fep.
The dark screws are stuck. Trying to unscrew the screws, I even broke the screwdriver
The clear ones are still in good condition while the dark ones have rusted.
It seems they are made as an iron that is oxidized.
I ask for advice to solve the problem.