Mt372 stuck clutch

[lightleader]

Great job, I'm looking at going into my clutch to find out why mine won't release. It was stuck when i got it, started it in 2nd high & drove it around holding the clutch petal in & after about 30 seconds she popped free. Has been good for a few weeks then (I read to prevent clutch sticking use the clutch petal lock) yesterday went to use it & when I released the lock almost no spring tension on the petal, can depress it with one finger. Clutch stays fully engaged. Any idea of what might have broken or stuck inside there?