Other than the MCAS and now the door plug hardware issues, the only 737 problems I know about were uncommanded rudder hardover movements in the 737 Classic models but I think that was addressed with a new rudder PCU servo design. But if you were in aviation maintenance, which I was not, you obviously know more than me. (Now if you want to know about submarine maintenance…)
Just don’t be surprised if increased scrutiny on Boeing’s manufacturing processes and quality practices reveals other issues....I’d be more surprised if it didn’t.