I had mine replaced back in December. From my work order.
7030640 Driver or passenger seat cushion heater replacement.
417 WGM
1 23223775 Mat
18746 7030640 1.20 Check operation or RF seat heaters. Seat did not get warm. Checked power to elements, both flashed the test light. Checked resistance of elements seat cushion was 18 OHMS and seat back was 5.5 OHMS. Replace seat cushion element only.
I hope this helps, they have been working better than ever. My truck was still under warranty thankfully.