Sewing machine (Golden Triangle NR2)

My 'old faithful' JL100!
It is mechanically fully working, however I stupidly tried to sew through sticky velcro and this has caused some kind of problem...there is obviously some adhesive somewhere in the bobbin area!
I have treated myself to a new machine but I am sure that, for someone in the know, this machine just needs some kind of 'clean' and it will be good to go again!