This issue has finally been resolved. Upon bringing the saw to a Husqvarna dealer for verification of a failed ignition module, this defect was confirmed and a new igintion module has been ordered. The confusing thing for me, throughout this diagnosis, was that spark was always evident, but under compression it was not up to the required intensity (question you raised). On the plus side, many things were addressed (fuel hoses, carb. gaskets, compression check, cleaning, etc.) throughout this long repair period. Thank you for assisting me with my diagnoses.