hi all,
have had same digital display probs, found removing dash quite easy only 2 concealed screws. Remove screws from lower panel, one on end near door with colour coded cap,1 screw either end bottom corners,and one on underside of light and mirror adjustment apature,left hand side of panel is on pushfit lugs and just pulls away only requires pulling away enough to access 2 screws securing bottom of dash cowling. remove 3 screws found in holes above speedo etc.the cowling can now be carefully lifted to access unplugging of switches in cowling.With cowling removed 4 screws secure display unit, tip display foreward unclip cables and unplug 2 electrical connections.
Unclip and remove cover on back of display to expose cicuit board.
I found on mine that there seemed to be play in the 2 lugs securing the odometer and a small pre drilled hole with no screw in it so carefully put in a small screw which stopped movement of lugs. Did not attempt to remove circuit board.
Touch wood 4 days now and display is fine.
Hope this is of help to someone p.s easier to do than explain.