Question: Searching for Library procedure

I am not desperatly seeking Susan but the code of the DoFit procedure (for what this early-year joke is worth)

showstat(Statistics:-LinearFit)  reveals LinearFit uses the procedure Statistics:-Regression:-LinearFit (lines 4 & 9).

Next
kernelopts(opaquemodules=false):
showstat(Statistics:-Regression:-LinearFit):

indicates the Maple procedure which really does the LinearFit has name DoFit (lines 6 & 16).

I spent some time using the Library assistant to try and find this procedure, in vain.
Where can I get the source of DoFit?

Thanks in advance.

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