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T5004 the side with 4 terminals should have w terminals connected with one trace and two connected with the other. The schematic won't open on my phone so from here I can only make educated guesses. I would assume the resistor is connected across the two traces on the.4 terminal side, and that you are getting a very low resistance across those terminals. A transformer winding is just a coil of wire so assuming those two traces connect to the ends of T5004 there should be a likely low resistance there from the transformer... check the transformers rated resistance on that winding to confirm it is not shorted. Transformers can be wound for any resistance on a winding and anything between .1 and 70k ohm could be possible depending on the circuit.
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