My mobile data (4glte / 5g) has quit working

I've reset the network w/o success. I removed the rear cover and the moisture indicator is blue & the lower moisture indicator on the speaker module is red. I don't see any signs of water damage and the phone has never been submerged in water.

Any thoughts on what the issue might be. I plan to replace the battery while the phone is open. Which pcb contains the 4g /lte / 5g chips? I would replace them if I can find them online for a reasonable price.

Great site, thanks in advance!

-Jim