Flew in heavy rain. Possible hidden damage?

Hello all,

I was on an auto mission and my drone flew in heavy rain for several minutes. I have a large quadcopter on the X500 frame with Pixhawk Cube with a camera etc. The mission completed successfully, the quad landed as usual.

I rushed to dry everything and soon after I did test whether everything worked. So far I found no issues besides one motor having a slightly different sound. I googled and read on the Internet that there may be hidden damage and issues down the road…

Do you have any idea what to look for? Should I be concerned? Many thanks for any input