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@gbj_tester
http://techdocs.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/ST/EV-ST-7800-2258_v1_m56577569830609263.pdf shows how to remove them, along with the part number if you want to try to find some new ones. At £22.99 each, you might want to have a go at cleaning yours up before going shopping :-)