hello – forgive me if this info is already available somewhere – my cat performed a urinary offence on my 2880 and the sliders for channel 4 and mixdown were flooded and caked. those channels record and playback at full volume but the sliders don’t work. i tried every exposed screw but i can only access the offending matter by loosening 4 bolts on the faceplate with a very small “hex key” or “allen key” – i tried every size i have but they don’t fit. what key size do i need? if it is a rare size and the electro-harmonix warehouse will sell me one i will pay top dollar. i haven’t filled out the warranty card yet but i’m assuming my coverage has been defaulted by feline infraction. i love this pedal please help! thanks!