Hurricane Harvey Flooded Analog Telephones

Hello,

we have about 300 analog cordless telephones that have everything working on them except the ring when calling the phone. I am thinking it is a small component that needs to be replaced or it is corrosion that is blocking the connection. I am hoping someone can help me figure out where on this phone the defect is coming from. We tested the ringer and it works but when you call the phone it wont ring. All other features work just fine. If it is a component you see that needs to be replaced let me know a site it can be purchased if known. See photos
Thanks so much. https://photos.google.com/share/AF1QipPC5L6jAn3QgJFupduYqD3IHX_FZCPiB1o2wVeY6hfMYgMgPT7FiVBzmTGTN_zrMQ?key=Nm5iaHQtbEFJbDlYS250M1AxLWdPeXpZRkFscm1n
https://photos.google.com/share/AF1QipMOdsnQaXAmOdDOaMKLk0xX8wx2oYN4mGuKbDGvjgqoGC2NhDay1XfWH9OPyfSdtw?key=OC1NdTdhX1ZIc0tmbDVLN0pJdWFUUVpSaU5sLVFn
https://photos.google.com/share/AF1QipP_HRhUO5pzzV7tTGqphl6n4mzckGQRzfasGf7h91J64klS8p0-1dLRo3T_d2YuUQ?key=cy16MlFCbGh6ZXpoYTI1VTdTSEFSMmlhT1dzbVp3

Try mentioning what country you're in, and if the phones are ones intended for that country, as that has a great effect on phone ringing.

Does the caller hear the ring trip or quit or does it just keep ringing?