Yesterday evening at 5:30pm I replaced a switch. All was working fine afterwards - for a while. At 6:50pm four of our printers stopped reading the Total Pages Printed snmp setting. Just four of them - there are about a dozen other printers that are still reading that setting just fine. The ping sensor is working properly, I can get into the GUI of the printers, and doing a sensor discovery detects plenty of other snmp sensors I can add. But pages printed is not one of them.
Obviously this has something to do with swapping the switch out, but I have no clue what in the world it could be.
Any suggestions on where to start?