According to the rather incredible FanGraphs page for Geoff Geary, we see some telling signs of arm issues:
Average fastball
2008: 91.5 mph
2009: 89.6 mph
Average curveball
2008: 80.6 mph
2009: 79.4 mph
Average changeup
2008: 84.5 mph
2009: 82.3 mph
Average slider
2008: 82.7 mph
2009: 81.3 mph
That's a 1-2 mph drop in every single pitch, so it's not like he's taking something off his breaking pitches.