iPhone SE - No Service After Water Damage

My daughter had water spilt on her phone. I opened it up and dried any droplets I could see and wiped with some iso alcohol.

I left it open with some silicone sachets in a warm area for about 5 days. The phone switched on when charged but is showing no service so I cleaned the antenna area and tried again. Still no service but when I manually searched for network operators, 3 of them appeared. Does this mean the antenna is working and there is a problem with possibly the logic board or would they show up anyway?