Brushed and vacuumed flue pipe and heat exchanger Replaced oil filter, nozzle, and strainer Checked all electrical connections and safeties Performed combustion and smoke tests While performing the maintenance we found the pressure relief is dripping water. After heating up the boiler was at 22psi which would not cause the pressure relief to drip indicating the pressure relief is going bad. We tested the autofeed and found it is starting to get partially blocked internally. Checked the expansion tank and found there is some water leaking past the diaphragm. The combustion chamber is starting to crack and peeling off of the boiler wall. This may eventually fall over the blast tube and cause issues with the flame. Tried to open up the drain valve on the bottom of the boiler and found the drain valve stem is seized. Recommend replacing the boiler sometime in the future due to the age. This boiler is at least 30 years old. Took pictures for a replacement quote.