In my experience, when cycads are transplanted the oldest set of leaves tend to turn yellow and dry up, I think it's their way to cope with the shock. They may have also burned if you exposed them to sun quickly. Burning is easy to tell, the leaves dry up completely. Either way, they'll send out a new set of leaves and the old ones can be trimmed off later, you may have to wait though until next spring unless you give them lots of warmth, sun, water and a high nitrogen fertilizer for a few months.

Cycads are very tough plants, that's why they have survived 200 million years; they're hard to kill, but they are slow to respond.

If yours was recently repotted, you should (it might be too late) keep it in the shade and not water too much for about 2 weeks until the damaged rootlets heal and it gets acclimated, then slowly give it more sun and water over a 1-2 week period.

The best fertilizer is one with high nitrogen (>20) and it must have micronutrients.

I live in NY, and I easily water mine in containers daily when the temps are above 80F, they like a constant moisture supply provided the soil does not remain wet and the water drains out the bottom quickly.

Being you're in AZ, which is definitely hotter than in NY, you should probably be watering daily as well.

sounds like root rot to me. two of mine did the same thing. luckily I only paid $2.50 each for them. I cut off the damages roots and am waiting & hoping now that they'll sprout new ones.

I've never found those water meters to be accurate so don't use that by itself to determine anything. If there's a chance it might be rot, then I would pull the whole plant out and take a look and a smell, if there is rot you will know right away.