Here your parts
Model GGX9868JQ0

Here is a tech sheet
https://www.servicematters.com/d...0Sheet%20-%203978625.pdf

I cannot find anything that would indicate a faulty part external to the keypad that would cause this error.

There are a couple things you can do without a meter.

1. Looks like the keyboard ribbon cable has a connector on the end of it so clean it with either isopropyl alcohol or electronics cleaner and a tooth brush. Be gentle and do not reconnect till all the solvent has evaporated.

2. Check the inside of the plug on the ribbon cable to make sure the above 2 connectors are not deformed

3. Check the ribbon cable for cracks/breaks on the tracks. It is hard to see how transparent the ribbon cable is from the picture.

All the above is a bit of a long shot but worth a try.
Your keyboard is the matrix type, it not only has switches but also diodes to direct the current, that is why it is more complex to check out.

The only way to confirm this is to run the continuity test as shown in the tech sheet using a multimeter. The connections for the Perm. Press key is P3-12 and P3-11 but I would check all the keys.

I would suggest you purchase a meter. You can get a decent digital multimeter for under $20.00. You do not need fancy though it is nice if the leads are a couple feet long.
If it saves ordering one unnecessary part it has paid for itself and you end up owning a useful tool.
Most places will not let you return electrical parts so if you order it, you own it.
A couple things to watch when measuring ohms and continuity
1. Always remove power from the machine otherwise you could blow your meter.
2. Always disconnect at least one side of any device you are checking. This eliminates the possibility of measuring an alternate/parallel circuit path.
3. When checking for closed contacts and continuity use the lowest scale (Usually 200 ohms). Then try higher scales. This scale is 0 to 200 ohms so if the device you are measuring is 300 ohms this scale would show an open circuit which it is not, you are just measuring outside the scale's dynamic range.

There is a good STICKY at the start of this forum about it's use.

I found a solution to this very problem - and we fixed it ourselves. Ours was stuck in the permanent press cycle. When we would try to cange cycles, the buttons would have an effect, but the cycle would immediately switch back to perm press.

unplug your dryer and get a handheld hair dryer. Using the hairdryer on high heat, we applied a LOT of warmth to the surface of the touch panel. We held it on there for 3-5 minutes. You need to be careful not to let it get so hot that it damages the plastic. After about 3 minutes, we plugged in the machine. Still, the washing mode was stuck in perm press. But we continued with the heat, and got the panel quite warm. Suddenly, at some point, it became "unstuck". I was pushing a "normal" cycle while heating the panel and it finally held. We turned off the hair dryer, and then tried to operate the panel. All controls had returned to normal.

Hope this helps someone in the future. We saw in another help article, and I am passing along the solution here.