If your gyro still lights up you can try to verify that the servo is bad.
If by 6in1 you are talking about the receiver, you can do this:
1. Disconnect two of the motor wires from the esc (for safety)
2. Remove the rudder servo wire from the reciever and swap its position with the elevator servo wire.
3. Now when you give collective, two of the three collective servos should be working and the rudder servo should be moving.
4. When you give give rudder command, the elevator servo should be moving.
5. Swap the servo wires back to their original position.
6. Disconnect the battery and plug your motor wires back into the esc.
This will prove whether it is the servo or not.
Hope this helps,
J.