Hello everyone, I'm new to the forum and this is my first post and could appreciate any help and guidance towards learning to service clean my lillehammer myself. I bought the heater new in 2008 and have never had it serviced. However, it has intermittently developed a problem of just shutting down while it's being used. The store I bought it from told me it needed cleaning because of gas particle build up. I'm more than willing to do the work myself if I could access a service manual or if someone would be willing to walk me through the process. I really can't afford a tech house call at this time,so any suggestions on doing it myself would help. Thank you. Also I'm mechanical and have good tools and I know my skill level in most areas.