What drive have you got grampaw ? I have a NEC ND4550 that I have been using to do PI/PO tests, mostly its ok but it does tend to over report the PIE errors. Apparently this is known with this drive, I took some advice from Chewy and felt a bit better about my results after that.
Generally any red is not good from a scan, but as I am sure you know standalone players are set up to cope with a lot of errors so that unless you had lots of really really bad red sections you probably wouldn't notice it.
Below is one of my graphs using TYG02 media, as you can see that PIE errors are much more noticeable than the PIF's...
Given the 96% quality rating tho I am not unduly worried