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I have a Weil Mclain HE II boiler. Propane gas. Installed new in 1996. All original with the exception of the control module (replaced about 2 years ago and the blower motor (replaced about 4 years ago). Over the last year I have noticed an intermittent problem with flames in one or more of the burner tubes(there are 10 in this boiler). Generally it happens in the 2nd tube on the right side of the manifold closest to the gas valve. Occasionally it happens in some of the others, but always on the right side of the manifold. The tubes are clean and in very good condition as well as the orefices. Could this be a pressure problem? If so, how can I measure the pressure and adjust if necessary? Any helpful feedback would be greatly appreciated.