I've asked "friends" and neighbors for a lot less, and got rather little. That would be a really tough one. I've got a lot of stories. Just as an example, the pastor of my church recently placed several blurbs in the Sunday bulletin, looking to start a "Garden Club", so that volunteers could take care of some areas on church grounds, and I was the only person that made an inquiry into the "Club", and I'm disabled. My health insurance provider, Highmark Blue Shield, did arrange, after a very long wait, for a volunteer to help with some yard work. That person did offer to try to help with cleaning the chimney, so I could try to run boiler cleaning by him. He's 70, and doesn't do much work around his own house, so I'm guessing it may be over the top. I may invite him over this summer to watch, when I call someone in to do the job.
My local mechanic tells me there are tubes in the back of the boiler that need to be brushed of fly ash, and that it is done through the hole for the exhaust pipe. He also mentioned that there's a partition, accessed through the front hole, that hangs from 2 pegs, and that gets removed and brushed, and there's a shelf above that partition that gets brushed also. I take it that this part of the job is not as critical as emptying the chimney and exhaust area, as a clog could be far more serious than the boiler getting accumulations. After all, it hasn't affected the running for the past ten years.