It definitely looks like a LIF, Low Insertion force connector. If it were soldered in place the ribbon cable would not have the blue reinforcing plastic on one side. The photos did not seem to show any corrosion, but there may be a little corrosion that is causing the contacts to stick. If it is corrosion, you can try cleaning with alcohol to loosen the ribbon cable. If you can get one side to move but not all of the ribbon cable then that is corrosion.