You could talk to Keith at Aztec Hydraulics - 905-670-8080 - I've used Aztec for years to rebuild hydraulic cylinders of all types, including the welded ones, and been very happy with the results. Their website is:
http://www.aztechydraulics.com/
That assumes that the problem is the cylinder - I'd recommend getting a technician to check the machine before you do anything.
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