It's always better to start simple and escalate from there. This problem (frozen shifter linkage) comes up now and then.The shifter linkage may be frozen, suggest first taking that off and lubing it all up.
it could just be the muffler bearing.It's always better to start simple and escalate from there. This problem (frozen shifter linkage) comes up now and then.

This. It's not an uncommon issue and there were several incidents reported over time before The Great Data Loss. Depending on the miles and overall condition of the bike it might be a good preemptive effort as well as the cause of your problem. Even if it doesn't fit the problem it's only cost you a little time. This is a cheap fix/troubleshooting step and helps avoid throwing replacement parts at the problem. If you have to go into the Big Muddy it's best to wade in and not dive.The shifter linkage may be frozen, suggest first taking that off and lubing it all up.