In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to it's original condition and only parts identical to those specified be used.
OUTLINE
This model is based on the 20R200 with the difference in cabinet colour and some other modification. For your servicing, please refer to the 20R200/51R200/51R500 Service Manual. * The modified parts are referred to in the Parts List.