I picked up a fairly new Fluke 343A and it appears that Q39, MEM556C p-chan. 
enhancement-mode MOS-FET is shorted. This part seems to be unobtanium unless 
you are named Romney, Gates, or Walton. Any suggestions on a replacement or an 
alternative method? This part is the input signal chopper transistor, driven by 
a multivibrator.
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