D110 with about 6 million copies on it. Was getting 077-109 jams. Ordered in Invert clutch and Inverter in roll. Started hitting guide that that clutch operates. Adjusted clutch. Was all good for about 45 minutes of non stop running. Then started to give 077-111 jams with 2 pieces of paper on top of the duplexer when running double sided copies instead of under the duplex guide. Have already replaced one way clutches in duplexer and senors in duplexer. Was thinking about duplex solenoid. Anyone have any other ideas of what else to look at? Thanks in advance.