Hi all, Well i bit the bullet and opened up the RH450 to carry out the repairs and guess what, it was a real nightmare...... no not really it was really easy to do, here are some photos and a guide, i hope it helps anyone trying to do the same: Tools required: Allen key set Torx bit set (got mine from screw fix £5.99) Screw driver (pozi drive small) 1: First you need to remove the 3 torx bit screws on the top and the bottom of the unit. you also need to remove the rotary knobs from the