Test power fuses.
Test drive motor. 1.2ohms through fields (s1 to s2) around 1 ohm is acceptable.
Test drive motor field cables. They can break under the jacket.
Remove fuses to test fuses. Remove cables from motor to test motor.
Rec1 will be a large diode on the heatsink. There is also a small one. Unlikely this is your issue more applicable for code 23.
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