My upgraded housing has just returned from Ikelite.
They were offering the upgrade, which involved replacing the entire front section of the housing and swapping over all the hardware, at a very reasonable US$200 plus $60 for a full service.
The housing now has 4 port locks instead of just 2 and a focus light mount on top. Also got a free swap for the new 4 lock short port body including an anti-rotation lock for the 8" and they sent back my 3 leak alarms.
12th Dec
I have just discovered that this Fantasea LED 360 focus light has been discontinued. Apparently there have been production problems leading to flooding. Mine is still going OK but buddy Rich's has flooded.