There is no work required of the engine, all work is done with the tender.
The tender is disassembled through four screws holding the frame to the jacket.
The following items were then fitted to the tender:
ESU (58420) LokSound V5 DCC 8 pin decoder with S class sound,
DCCSound Premium sugarcube twin driver speaker (4 ohm)
The 8 pin plug is removed (DC operation), and the decoder plugged in.
The speaker is then fitted in the tender using double sided tape.
All electrical contacts are protected from possible short circuit with the metal model using Kapton tape.
Finally, the tender was reassembled and tested with the engine.