Driving down the freeway this afternoon, and suddenly, the clutch pedal would not disengage on the down position. I pulled the car over and I was able to retract the pedal to its normal position. When I started to move the car I would hear a grinding noise. I may have two possible issues - the clutch master cylinder and the clutch flex disk. Is this the correct diagnosis and is this a straight forward DIY job?

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200 75 W115 (Mom's)
190e 90 2.6 W201
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72 BMW 3.0 CSI