I have my 2913 open for service now as well. I think the lids are dampened by a round device inside which a lever gets dragged through grease, or possibly just plastic friction. But the key aspect is that the lid hinge needs to be connected to this round dampening device via a thin cord. Do you see any such string or cable? It will be the opposite side from the spring system. Essentially the spring on one side is always trying to pull the lid open, and the cord connected to the dampening device on the other side slows it down once the Programming button is pressed and the spring contracts, opening the lid. On my 2000 the cord had jumped one of the pulleys, but was still wound round the smaller metal axle.