This is just a heads up. The issue might pop up. Just received the below message from Athearn about one particular factory sound loco. They use the Tsunami.

Rich

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June 10, 2010

To Our Valued Dealers and Customers,

After our DCC, sound-equipped Norfolk Southern GP15-1s were shipped, it came to our attention that  the front ditch lights did not function as intended.   

Thankfully, there is a relatively simple fix for this by adjusting CVs on a DCC-equipped layout or section of track and the front ditch lights can be corrected to their as-intended configuration; directional operation, with the ditch lights alternately flashing when the horn is blown.  

In order to complete this modification on your Norfolk-Southern GP15-1, the following CVs will need to be changed:

CV33 = 1
CV34 = 2
CV39 = 6
CV40 = 0
CV49 = 15
CV50 = 15
CV51 = 41
CV52 = 57
CV57 = 51

This adjustment should only take a few moments to accomplish with most DCC systems (please check the Owner’s manual or other documentation for your particular brand of DCC system for guidelines on adjusting CVs), and should result in the intended operation outlined above.  

If you have problems please contact us at help@athearn.com

We apologize for any inconvenience this may have caused.