[CA11] AP needs lubrication

I have recently purchased a sailboat with an ST6001 AP. The drive unit has begun making noises - although operating just fine. The noise is consistent with a need for lubrication or wear, not that a part has drastically failed. When I switch the unit to Standby, the noises disappear, so I know the issue is related to the AP.

I'm not sure what manual/document to read to begin to understand the drive unit and what/how to inspect it and/or lubricate.

Any advice or direction would be most appreciated!

TY,

David