I use an Iwata Eclipse HP-BCS. There are bubbles in my paint cup. I already cleaned dry paint off the needle..there really wasn't much. I was using a .35 when this started. I placed my .50 back in and had the same problem, so I'm thinking there is blockage in the paint 'port' for lack of a better word. I have a cleaning kit and tried snaking out whatever is in there..no luck. I gave up after an hour.  I placed my finger over the end and no air backwashes out of the paint port at all. I use Tamiya paints properly thinned.Anyone have an idea as to how to resolve this?