You can use the unused CN5 port on the MFU. This is 7.2V and will require a 360 Ohm resistor to protect the LED's.
This feed is on all the time. If you want them switch-able, get one of these and add it to the circuit upstream of the LED's, and connect the RC cable to a spare channel on the receiver:
http://www.ebay.co.uk/itm/1409892480...84.m1439.l2649