Investment Records Management Ethics

John is a portfolio manager at a reputable firm, and he has just concluded a rigorous analysis of a potential investment in a biotechnology company. He meticulously recorded all of his research notes, analytical calculations, and decision rationales in a personal journal. However, due to unforeseen circumstances, he has decided to leave the firm and take a position with a competitor. Before departing, a colleague suggests he should take the personal journal with him as a reference for future decision-making.

According to the CFA Institute's Code of Ethics and Standards of Professional Conduct, how should John proceed regarding the records he has kept on the investment analysis?