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I've been learning about steam systems via "we got steam" but wanted a professional look it over as well. we started at the boiler and in flushing the system discovered a clog in the glass gauge - we basically emptied the boiler but the glass was still full - and after clearing it with a piece of metal got it working again, though the water bounces around a lot when the heat is on. the plumber recommended I start by replacing the gauge assembly, pressuretrol and pigtails and also clean the probe. i wonder if this is something a mechanically inclined person can / should do themselves or if the cost ($800) is a small price to pay to get a 20-yr old boiler into working order. tx / Iddelz