2003 Cav clutch question

When releasing the clutch in my '03 Cavi I get a squeaking/creaking sound. Took it to the dealership and went for a test drive, the foreman said it was the master cylinder that was making the noise. Of course when I asked him if it can be fixed he said no. Just another thing I am gonna have to deal with I guess. Since the master cylinder is plastic he said it will expand when it is hot outside and as a result will make this annoying noise. It honestly sounds like a squeaky door!

Has anyone experienced this problem? Is it normal and can it be fixed?