Good to hear that it's fixed.
FWIW, with this type of contact, it's best NOT to do the 'quick flick' mentioned earlier in the thread as all this usually does is push the dust/dirt/whatever more firmly into the contact. That method worked well on old style contacts, but almost every organ and keyboard since the mid/late 1980s has used the rubber strip method. Cheaper to produce and install and usually very reliable - but susceptible to dust getting in. Easy to fix, but takes some time dismantling until you get to the darned thing.