Please show me the way to replace it with an equivalent one.
The chances are good that this is a 1SMA4742 12 volt Zener diode.
The datasheet is from a different manufacturer, but I'm pretty sure it is the part you need. Other companies that make the 1SMA4742 also mark them "472."
The "PG" is probably a date code. The comment from tlfong01 suggests it might be code indication packaging material. That may well be true.
From looking around, it seems the 1SMA4742 is a surface mount version of the 1N4742 12V Zener diode. The 1N4742 comes in a conventional through hole housing, and may be more commonly available.