In the official version of artificer, the ability to create a homunculus servant is gained at 6th level. Among its other abilities, the homunculus can:
Channel Magic The homunculus delivers a spell you cast that has a range of touch. The homunculus must be within 120 feet of you.
The homunculus regains 2d6 hit points if the mending spell is cast on it
Mending has a range of touch. Is there any reason an artificer cannot use the spell to repair his homunculus servant so long as it is within 120 feet?