Auto on PSW 300 sub

Having trouble with my PSW 300 sub. It stays on all the time! At first I thought it was getting some sort of signal from my receiver (sony strd-1000es) even if the receiver was off. But If I unplug it at the sub input it will shut down in about 5 min. If I leave it plugged in at the sub input and unplug it from the receiver it just stays on. How do I have this repaired. Is there a part I can replace myself.
Ray E.
Ray E.
Post edited by Ray on
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so it is my opinion that you should contact support or your dealer and have it repaired which in most instaces it will be replaced with a brand new amp.
Thanks, I appreciate the help.