No Power to Heated Mirror

[Flyboyrich]

2003 E53 with a specific heated mirror issue... I'm getting no power to the heater element for the drivers side mirror which was verified using a volt meter on wires which connect to the mirror. Troubleshooting so far has consisted of: cleaning contacts of wires to ensure good test, checked all circuit breakers related to mirrors in glove box fuse box, all other functions of mirror's motor (and window) are functioning, and during testing the passenger side mirror heat was functioning. Aside from a broken wire some where I'm at a loss, I have no idea where else to be looking I'd greatly appreciate anybody's ideas.