did a search and read another posting similar....it read:

"took out the "Relay Module" box. Mostly all of the relays are contained in this box and soldered to a circuit board. Then I had to open it up and find were the K40 Relay was on the circuit board. Wasn't hard to find because there were two BAD solder joints for the K40. I re-soldered the connections and I haven't had a problem since."

Could this be my problem?

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99 C43
98 S420
99 C230K
01 C240