- snip- Statistically, the 737 has had a better than average safety record over its nearly three decades of service — 1.21 crashes per million flights for older models and 0.51 crashes per million flights for newer models. The figure for passenger jets of all types is 1.83 crashes per million flights -snip- (My emphais)

And the most common malfunction on them seems to be connected to the Rudder, and not any cabin pressure issues.

I'd not be worried about it, unless I happened to be flying by Russian backwater Airways or suchlike.....