PDF of ai file changing parts of spot color to purple

I work in pre-press for a printing company and we received an Illustrator file (.ai) of a logo. It is one color (Pantone 576). When the file is saved as a PDF and opened in Acrobat 9, some parts of the file are purple on screen and other parts stay 576. All type in the image was converted to outlines and all but one letter of the converted type turns purple. Also, one part of the graphic turns purple.
We did not create the Illustrator file but it looks like part of the image was Live Traced and another part was drawn in Illustrator but I'm not sure and the customer doesent have a clue. There is only one layer in the file and there doesn't appear to be anything hidden. If I open it in Acrobat 8, it looks fine or if it is printed it looks fine.
The image below shows a section of the art that indicates the problem. Has anyone else had this problem?

Depending on which program is used to open the file here's what I get
Open with AICS3, It tells me that an new version was used but it will open. Everything is a single color (576) but in preview mode there is a clipping mask around the letter that is the wrong color.
Open in AICS4, There is no clipping mask, everything is one color (576)
Open in Acro 8 and 9, The file is two color with the odd colored letter
Do you have the original AI file to look at?

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PDF of ai file changing parts of spot color to purple

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