Marks on cymbidiums- should I be worried? *pictures*

[Jol]

Hi All,

I'm a bit of a newbie when it comes to orchid care. I am the proud owner of a few cymbidiums and I think I am officially addicted, I want more and more! Two of the plants are very precious to me, as they were bought for me by my mother and sister-in-law when our daughter was born.

My only concern at the moment is that there are some strange markings on my plants. I have attached some pictures for advice...if anyone could give me some advice on what they think the markings are and a course of appropriate action if necessary, I would be most grateful. I am wondering if some of the black marks are sunburn and the grey spots are scale? I am unsure about the faded yellow spots.

Some background: The plants are all housed outdoors in Sydney Australia, they receive plenty of air, morning sun and are watered as needed. All of them have flower spikes starting so I am very excited!