very glad it helped you! greetings from Malta

generally the only service it would require is a new leather pump seal and it's checkvalve as the washer that seals the vapourizer to the fount is made of lead and the washer that seals the control knob is made of graphite (IIRC). if i was in your position i would check if the fount is clean internally, pour some fresh kerosene and pump it up to get it pressured (with the knob pointing upwards ie. closed (if my memory serves me right). then check for any kerosene leaks. at times, the 550 and 1550 tend to leak from the shutoff valve (located inside the found) and thus kerosene would pour out from the jet at the top. To get to that seal you would need to disassemble the whole vapouriser unit, but it is not a big deal. if the pressure test is all well, you can proceed in lighting it up (the correct way ofc). if the fount is dirty internally i would proceed in cleaning it as the dirt particles can clog the vapouriser. hope this helps! happy lighting!