Took the morning off and planned to work this afternoon when I discovered that the PTO switch on the bucket truck wasn't working. After checking fuses and lines, I figured that I may have done something to the circuit board on the back of the switch when installing the stereo and power supply switch for the backup camera on Saturday.
My local International dealer didn't have one in stock, but their store in Mississauga did. After an hour drive there and another hour back my chance on the $140 board paid off and it's back working.
On a plus side, during all this, we discovered the emergency backup pump for the hydraulics had corroded wires. Easier to fix at the shop than on the job site.