Thanks for the parameters Mike. I loaded them up, and I also addressed the low lube alarm. There's no more alarms, yet it still wouldn't do a tool change. Then I noticed there was a stop code, T03 Block Stop 0301, which in the manual says Single Block Mode is on. So I tried pressing the cycle start button multiple times, and step by step it did the tool change! That tool change arm was scary fast, so I slowed the rapid on that sucker down. So I started digging into the ladder, and found that the Single Block mode is output Y21A in the ladder, and among the inputs is device X13B which was permanently stuck on. I then forced device X13B to a zero bit via the PLC I/F screen, and tried to run the tool change in MDI mode again. The tool change proceeded as expected without having to hit the cycle start multiple times. So now I just have to track down what device X13B is and I should be set. I don't have a wiring a diagram so I'll be reaching out to Mori to find out what it is.