You could post a pic if you're really concerned. ..
Is your turtle small? Has he been doing some growing? It's not unusual for the seam down the middle of small turt's plastrons to be slightly pink, especially if there's been some growth.
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-
A pic would be great so we can see what this 'slightly pink line' could be.
i agree with marisa.
has s/he been growing at all?
can you send a pic of the plastron dry?
Oh and its been pink for some time now maybe 2 weeks or more and it seems that the pink color dissapears when i put my finger on it and when i take my finger off the pink color reapears.
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Bamboo (Hieroglyphic River Cooter)