Don't know if you got your trimmer fixed but yesterday I was working on my 034 Stihl which had become harder and harder to start and in the end would not start at all.
I determined that it wasn't getting any fuel mixture to the spark plug.
I verified that fuel was reaching the pump located on the carb and after taking the pump apart I found that there were two passages blocked by sawdust residue. It looked like at least one was a vent to the outside of the pump.
I cleaned her up and the saw fired on the first pull and started on the second.
Hope this helps,