Exercise cycle (Wonersh, south of Guildford)

NordicTrack exercise bike apparently model number NTEVEX74013.0. Working to a degree but the drive belt slips and so makes for an unpredictable workout. Nothing wrong with the electrics. Needs someone who knows what they are doing and maybe a new drivebelt in order for this to be properly useable but it's beyond us. Anyone up for a challenge?? It is pretty heavy. Going to the dump if no takers.