The fact the there may or may not have been an issue with one of the engines does not change the central fact of this accident. The pilots not once, not twice, but three times deliberately chose to continue the approach below minimums.
Cat 1 limits mean that even in the event of an aircraft malfunction you should still have enough room to recover and overshoot. By conducting an illegal below minimums approach they gave away that margin with tragic results.
The take away is clear. Don't continue below DH unless you absolutely have the required visual reference. If your employer has a problem with that you need to find a new job, I did just that early in my career. It was hard at the time but it was one of the best decision I have ever made.