(note that during downscaling the texture to better match the game’s texture resolution, I tried brightening it to fix this issue, and even then this is still happening)
Brightened texture (used in screenshot):
Original texture:
Door I textured for comparison:
I don’t think it’s an issue with the material, here’s what I think would be the relevant params for the door and the vent, if you need to see more say so
another example against a similar door texture using the light switch, pipes, and button props, showing that non dark metal props such as the switch also appear dark
pipe:
button:
switch:
Original texture: 
Door I textured for comparison: 
button: 
switch: 
