Just finished my VPR floor box and rack build this weekend, very easy build! I just got everything loaded up and it's looking like channel two isn't passing phantom power. I measured the connector and all the measurements look fine and the same as the rest (-16V, 16V, 48V, etc.). The preamp I first had in the slot that showed this was a VP28 I build last year - there is a bit of a hum from the channel with nothing plugged in that mostly goes away with a mic plugged in, and it's fully functional with a dynamic mic. But when I press the phantom power with a condenser there's a noise similar to a plosive in a vocal, and then the mic never powers up. At first I thought I might have messed something up with the VP28 when loading things into the new rack, but the same preamp works fine in other slots, and my other VP28s and a Lindell 6x500 all exhibit the same behavior when in slot 2. Any ideas? Thank you!