Performed 8-12 tune-up and cleaning on 30+ year old boiler that was failing to maintain temperature above 60 degrees. Cleaned burners and burner chamber, but discovered severely plugged and deteriorating heat exchanger with dangerous CO readings (over 100 ppm in flue, 2 ppm leakage outside jacket). System operating at sub-70% efficiency with buzzing transformer/relays and leaking gate valve. Recommended immediate boiler replacement due to safety concerns.
