For an eight month period, the Fermilab Drift Tube Linac operated while one of its quadrupoles was not available. The machine was retuned during this period to minimize beam losses, and a complete set of data for these conditions, including residual radioactivity readings, was recorded. During the last shutdown, the drift tube (#19 in Tank 5) was replaced and now has a fully functional quadrupole. Again, a complete set of data for the normal conditions was recorded. The two sets of data have been analyzed using the PARMILA code running under PC-WINDOWS in order to determine the accuracy of the simulations.