Hi i have a baxi lfe back bolier last winter we had prombels with a blocked f&e pipe british gas came and quated £850.00 for apower flush so i relpaced blocked pipe flushed all rads and heating ios now the best its been for years but for one thing the boiler is making a gurgling sound and bangs from time to time i added fernox boiler silencer this helped but there is still some noise so i plan to remove the heat exchanger and clean it out and clean the pipes that feed the bolier so my question is this, is the removal any easy job as i have no instructions for this boiler