I had to replace this on my Dometic fridge (2600 series,I think) installed in an Alfa Fiver but was not located in a slide out. It was a several hour job and required assistance to lift the unit out and back in as it is necessary to remove the fridge from the "box' surrounding it (made easier by removing the doors first to reduce the weight). It is easily done if you have the installation manual for the fridge and icemaker as it shows all the fastening locations etc)
The fridge is fastened in place by several screws around/under the front trim, top and bottom, and several screws in the base plate in the back. Water, propane (shut off the main valve FIRST) 120V (A/C plug) and 12V have to be disconnected from the back.
The plastic line runs from the Water solenoid, behind the coils and to the top of the fridge where it connects to the plastic fitting supplying water to the ice maker. This fitting is buried in the foam insulation on the top right hand corner as seen from the back) and covered with a silver metallic sticky tape.
!!!!There is a small metallic tube in each end of the plastic line which MUST be installed in the new one. It prevents the plastic line from loosing its shape and being squeezed closed!!!!!
The water solenoid and wiring, gas etc are accessible from the outside panel if you have one. If the ice maker is equipped with a heater the solenoid may be covered by a heater wire encased in the sticky metallic foil and wrapped around it.
After reconnecting the propane, check the connection for leaks using soapy water!!!
Alfa 38 5ver (Florida)