Yes give JRV a call they can fix you up . My black tank issue was the circuit board for the holding tanks $70. I ordered a resistor harness also just for a spare . I think it was $10.
Ray & Melinda
2005 National Dolphin 5355 (MEPAW) , Safe-T-Plus , Track Bar , Sumo springs . She tows a 2006 Tacoma 4X4 .