My Frigidaire microwave has recently stopped heating, but otherwise seems to work fine. I had a repair man come and look at it and said it was the magnetron. I purchased a used magnetron and replaced it myself. It is still not heating. I found the service manual for my model and starting going through the high voltage testing.

The magnetron tests fine, the diode tests fine, and the capacitor tests fine. I then tested the transformer. The service manual says the high voltage output should come in at 82.5 ohms. First, I have never really used a multimeter, and mine has multiple different resistance settings (2000k, 200k, 20k 2000, 20) and it also has a sound option next to the 20. When I set it to the 20 and the sound option they come in at 156. I take it that means 156 ohms. Everything else on the transformer tests fine. Would this most likely indicate the transformer is bad?

Thanks in advance