Hi Paul
Sorry for the late reply. I was checking regularly but after a few days I didn't think a reply was coming. I did eventually get it off. Just a matter of getting a good grip with needle nosed pliers and carefully pulling up slightly at each end. I don't know if I had already loosened the clips at each end but I didn't even have to open them up while pulling, it just came off.
I do have the service manual downloaded but although it has a few good tips, it doesn't really give any directions for disassembly.
Cheers
Stan