Way to battle through it! I had an unexpected battle changing implements on my tractor today. With pressure released on the hydraulics I still couldn't get the couplers to connect. Ended up removing the fittings from the grapple side which released pressure, not sure why there was pressure, temperature maybe. Anyhoo, cleaning off plumbers tape, breaking apart connectors which were torqued like a Mo frer. All that and I moved one small tree and a few branches I coulda got with my bare hands, geeze.