I've been asked to swap a logic that is 4 years old with a split hex. But ideal won't swap hex as the flue hasn't been fit correctly and the turret rubber has been pushed out. Thus been leaking into the boiler and turned everything brittle etc. I haven't seen. Ideal have apparently supplyied a boiler at cost. If swapping people would obviously leave the bracket on if fixed correctly and secure. I'd probably swap the valves. I said the flue would need swapping just as it's 4 years old and the boiler is new. It comes off the turret travels about 400mm then an elbow and exits to outside with the 600mm standard flue. Have I been over top advising the flue would need renewing? Thanks