Soundtraxx Tsunami GN1000 Troubleshooting

Please help!
I have a GN1000 drop in decoder that doesn't allow me to read or write the CVs but yet the red light on the right "front" area of the decoder stays solid on when on main line.
The light sporadically blinks when attempting to read the decoder. Then I get a 303 message (while using DecoderPro V4.4) implying that no decoder is present.
Any ideas or tips will be greatly appreciated.
Blessings
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On 2016-09-03 00:41, TrainRev wrote:

The most likely cause is a defect in the decoder. Try testing the decoder alone, outside of the engine.
Good luck,
--
Best,
Wolf K
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