Thank you very much for your response, and the link.

I had a look at my settings for bed temperature. I currently have the bed temperature at 70 degrees. However it appears that is initial bed temperature. It then drops to 60. Thankfully I want to print a few more of the exact same model, so I will reprint on a steady 70.

I will give the bed to thorough clean with 99% IPA. A next perhaps a coating of PVA.

Thx again!