SLAs and Manpower cuts

I’ve been given a very short suspense to come up with a plan on how to impact pending personnel cuts to existing SLAs for availability and incidents (trouble ticket). Has anybody been through this? My initial approach is to determine the total number of tickets YTD and monthly as well as the percentage of tickets by each work group by location. Factoring in the current man-power, we should be able to come up with the average per group/site. I’ve also thought of making the managers determine the “ABCs” of their groups. As equipment is fairly stable for overall availability, I suspect very little time is spent on other activities (backups, PM’s, IAVA’s, upgrade/recaps, or installs) compared to working incidents.

Any other suggestions?