I figured it out (actually, I logged a TAR) it has something to do with OEM, which I should have guessed.

#1 Save all jobs and events against this node to the job library in OEM Console
#2 De-register jobs and event against this node
#3 Remove this node from the OEM console
It may hang for awhile
#4 Stop agent
#5 Remove these files from the agents Oracle_Home
O_H/network/agent/services.ora
O_H/network/agent/*.q
O_H/network/admin/snmp_ro.ora
#6 Start agent
#7 Discover node in OEM Console
#8 Set preferred credentials
#9 Register the jobs and events from the library