Couldn’t hurt. Your coco pod looks very dark/wet. Is it more than slightly damp to the touch? Has the yellowing spread to the other large set of large leaves? Can’t tell from the pics.
Everywhere except the very top!
Open a ticket, it could be something on their side. Can you confirm that your cocopod isn’t too wet? It should only be slightly moist.
It’s moist not really sure what too wet would be
Have you checked your air pump & stone?
Do you have a small USB fan inside?
Have you been adding any extra water?
Did you do a complete sanitize and probe calibration before starting this grow?
Make sure to ask if your water sensors are ok when you put your ticket in.
New unit 1st grow. How do I check the air stone? No fan inside. Just did a drain/fill yesterday should I have calibrated with the new unit?
Are there air bubbles in your reservoir? Lift the lid and take a peek.
Yea bubbling!
Good 
Let us know what the Grobo team says!
Hi what temperature is the location you have your Grobo in.
-
(You might want to start drying out your [Coco-Pod] now that the leaves have formed enough): (Your [TapRoot] should be low enough to stabilize itself from needing so much moisture in the [Coco-Pod]): (Add an extra fan to help do so):
--
