I'm working on a Manitex 124SX. The nameplate is a SX 28124 SN#146260. Mounted on a Sterling truck. The machine is settling a bit while running it for a few hours as in the outriggers are creeping a bit. It has a 4 valve manifold that goes out to each outrigger cylinder and a block on the cylinder which looks like a crossover relief valve to me but not quite sure about that. I have swapped manifold valves around and the creep stays with the drivers side front cylinder so I think its worn out seals in the cylinder. Does anybody have a seal kit or a number for a seal kit? I've tried a few places and have been getting no help or no response about the outrigger cylinder seal kits. The boom truck is about 20 years old I think so the seals are probably at their end of life. Thank you.