Hi,
A reddish tinge to the top of leaves usually means the plant is getting to much sun. A pink/purple coloration to the underside of phal leaves usually means the plant has pink/purple blossoms or pink/purble in its background. As with everything with orchids there are expections to all rules. I'd check the plant through out the day to see if the sun is hitting it at a certain time. You can also tell if the plant is getting to much sun by feeling the leaves. If they are warm/hot to the touch they are getting to much sun.
Hope this helps and I'm sure others will have some more ideas.
Al
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