[HAM] Noisy upper rotor motor

[Armond]

My upper rotor motor on my 147 has gotten noisy of late in slow mode. It's a
rattling sound. The horn rotates normally, but the noise is annoying,
particularly when recording. 

I'm guessing that it needs oil, but am not sure where the oil goes on a
Leslie motor. Any suggestions will be greatly appreciated. 

Peace --armond