I checked the Kepco power supplies located at the end and mid stations.

EY - Temps < 72F, Rack C1 17-19 (PCAL +/- 18V irregular vibration noted, low draw <1A per rail)
EX - Temps < 72F, no vibrations
MY - Temps < 72F, no vibrations
MX - Temps < 72F, no vibrations

Recommend replacing fans on EY PCAL +/- 18V supplies due to irregular vibrations.