I found the cause.
Change the bottom of SUB EmitIfCond to the following:
IF iOutputMethod = ePart THEN
FPRINT Outfile, IF_Stmt_Buffer$; ' MrBcx 761 -- Fixup XFOR formatting
ELSE
FPRINT Outfile, IF_Stmt_Buffer$ ' MrBcx 757 -- This replaced FPRINTs in prior versions
END IF
END SUB ' EmitIfCond