continuum air leak

Hi i am new to the site and reaching out for help! Just bought an crown continuum in .22 and it arrived on Monday, come wednesday i opened a new tin of 25g redesigns and they started jamming in the barrel i tried firing to remove them! the barrel was eventually cleared of the blockage by a colleague but now power is down and i can hear air eascape from around the probe i suspect there is an o ring gone in the breach! is this a difficult repair job or does anyone have suitable links to a youtube video. your hlp is appreciated