Bob Dunlap of Pacific International Service is the warranty station for Marlin.
BTW, never heard of the Marlin Jam. Unlike shotguns, Marlin doesn't have two shell stops. There is a tab on the bottom of the carrier that, when the carrier is in the up position, serves to prevent the next shell from popping out of the magazine tube. When the carrier is loaded, the nose of the bullet is supposed to retain the next shell in the tube. Hence shell length is critical in any Marlin lever action. If the shell length is too short or the bullet gets driven into the case from the recoil, it is possible to have the "Marlin Jam" as described in the link.
Vigilantibus et non dormientibus jura subveniunt. Molon Labe!