Audi a6 c7 2.0 tdi manual

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Hi. My clutch pedal was stuck to floor, it's the cylinder which is inside gearbox, but apparently the flywheel needs doing too but the engine is not making any strange noise, could it still be flywheel if there's no unusual noise? Also when I had it towed, can it harm the flywheel if gearbox was in gear while being pulled onto towtruck? And can a cylinder leak harm the flywheel? Thanks