I have a Burnham V-74T/Beckett Burner oil fired unit that recently failed to fire obviously creating a smelly mess. It has been cleaned throughout and the firing chamber liner replaced as of last monday 1/16/10. I noticed since then that there was a slight smell when in operation cycle that was not there previously. The boiler is located in the basement. Today it failed to fire again and I have shut it down. The service man will be back in the a.m. and I would like to know what other possibilities to look for. I know he adjusted the draft from the original setting.