The UV (and Solar Lux) data is encoded in the "Solar Pod" and sent as a separate data packet directly to the "transmitter" section of the "External Unit" (via the 6-way cable into the "rain" socket). So obviously the radio transmitter itself is still functional, but the microcontroller section (which reads T/H/Wind, etc. and encodes this data) has failed or is being upset by moisture, etc. on the circuit board.
The 1080 actually uses/supports three separate wireless data packets, for "External Data", for "Solar Data" and for "Radio Controlled Time" (the receiver is located in the External Unit). As said, the glued enclosures usually can be prised open with a knife or credit card, which may be worthwhile because it probably uses the far superior FSK wireless protocol and hardware, compared with the more recent (low cost) OOK.
Cheers, Alan.