Had my chain jump for the second time last night (maybe it is just a coincidence). After reviewing earlier postings I will slack off the bolts for the slats on right and centre chains, rotate conveyor, then retighten just in case the chain was twisted. Upper drive cogs look fine, chains are even, no bent slats, tension is equal on the springs and the chain is quiet. Is there anything else I should monitor_observe_doIJ David