Fault in my 2m Horizontal Antenna

It looks like I have a fault in my antenna system for the 2m Big Wheel antenna.
The PA suddenly started acting up when I used the HF Vox with FT8 on 2m. The antenna was tested at the radio end of the cable, and suddenly the SWR is around 2.5:1 over the whole band.
It is dark and rainy outside, so a check will have to wait until tomorrow. Climbing in on a wet ladder and in a wet tree is no fun.
Pity, because I was reading English stations on FT8 tonight, but no use ...

Update : Checked if the connector indoors was faulty, and used the opportunity to change it from a PL-259 to an N connector. I am expecting the new PA this week, so better be prepared.
Tomorrow I will check the outdoor part of the system, hoping it is easy to find and correct.