Took the skimmer apart today since it stopped producing bubbles. I thought the airline was pinched, so did a quick fix prior to dismantling, nope not that.
I did find this.
I minor clog in the air inlet, nothing a drill can't fix
Upon closer inspection to the muffler, there is water in there and what looks to be some sort of algae.
I modified some Q-tips to absorb the water, no more water in the muffler. Time to put it online again.