Searched HOSeeker and wider Google search but have unable to come up with servicing instuctions or parts map for #5429 (a 1986 run) for this Rivarossi/ConCor edition. Anyone with any ideas as this units drive is different than my 20th Century and Blue Goose Rivarossi.
http://www.rivarossi-memory.it/english_version/Rivarossi_Nota_Eng.htm
http://www.rivarossi-memory.it/Cataloghi_pubblicati/Ricambi_1990/Ricambi_1990.htm
Try that site might be able to help you