Hi, while I don't know specifically where the pump relay is in your coach in my 2013 ACE 30.1 there are three relays under the bed, one of which is the pump relay. The others are ignition lockout relays to prevent operation of devices when the coach ignition is on. Attaching a picture of the three relays for your reference. You could try calling Thor with your VIN number and see if they can advise you on relay location.
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