I have been in dialogue with Martin Hadlow who has been the WRTH collaborator for Solomon Islands.
At my request he has been in touch with SIBC and he has just advised:
Have had a response from the SIBC in Honiara.
Their MW transmitter is on and working OK. The problem is with the Japanese manufactured transmitter on shortwave. (I think the one TX runs both 5020 and 9545 frequencies). The SIBC technical team is getting advice from the Japanese manufacturer. The equipment came back on-air briefly a few days ago, but is off again now. They are working as hard as they can to get it fixed.
(Bryan Clark via WOR io group)