Punch 150hd resistor values and possibly schematic

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Alright fellas so I found that when my probe slipped it shorted an output transistor. I'm all out of IRF540s so I have to wait on them. In checking the resistors I found that the source resistors R18 and R19 are reading open/high resistance instead of .1 ohm. This is not on the bank of the transistor that just shorted out. Could it be what was causing my missing top half of the waveform?
 
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