That is why just looking for loose TMP connectors may not be sufficient. While you are inside the K3, give all the TMP connectors a slight twist which should clear some of the corrosion. 73, Don W3FPR On 7/27/2020 6:25 PM, Wes wrote: > I've had TMP connectors badly corroded in my K3. See: > https://groups.io/g/Elecraft-K3/album?id=37256 > > Wes N7WS >