The entire LHP (Evaporator, Condensor and all lines) is a sealed system, so assuming there are no leaks from physical damage to any part of the loop, there is nothing to wear out, no liquids to top up, no pumps to break and no degradation in performance, so it should give trouble-free service for the lifetime of the product.

The condenser would benefit from occasional cleaning but as there is no forced airflow, it would be less prone to dust buildup, especially if it’s running and generating heat as the convection will discourage dust from settling.