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What is wrong with my yucca?

My yucca were in the same pots for years, completely neglected in the back of the garden. 

Last autumn I repotted them (I used mainly MPC and some garden soil). They progressively got worse: went yellow and browning - see pictures.

Was it the MPC, was this a bad idea?
any help would be appreciated... 

they have survived harsher winters so I doubt it’s the winter cold. 
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