Nothing actually printed? Usually this happens when the print detaches from the plate.
I guess it could happen that the front cover opens itself somehow and this would certainly cause a mess.
As korneel suggested it is cleanable but you probably need some new parts
please contact your reseller to help you out.
you can slowly warm up the core a little bit and start removing the PLA but you will probably need a new aa core and probably a new fan bracket.
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