Your posts and disconnects are the smallest passage for. the beer to pass through. They're you're most likely suspects. Just releasing the pressure and moving things around may clear a blockage but it's likely to come back.
i'd try to clear it, pour off a pint or two to make sure any trub is cleared from around the diptube, then transfer the beer under pressure to another keg if you have one. That would leave you with a nice clean keg of beer and all the trub left behind.