Roger that.
With 45 years in aviation, that's my take on this also.
Not a Boeing apologist, but the blame is mainly in the realm of maintenance, (or lack thereof).
My experience was mostly Naval aviation maintenance so I’m not really familiar with commercial A/C. As I understand it, every airline fields their own maintenance teams.
At any rate, Once the failure point(s) are identified detailed records SHOULD BE available to see who did what and when....that should tell the tale.
With the gear failing to deploy through the normal hydraulic powered unlock actuators, the secondary gravity deployment( backup) also failing can indicate a lack of grease.
The fact a 67 triple gear lube normally takes two men ( or three woman) about eight hours of pumping nasty, black grease into locations rarely seen, usually on midnight shift, suggests those upper trunnions and unlock actuators were starving for grease…..
I can say without doubt, in my 13,200 plus days in the profession, the “ quality” of the new hires hired under the airlines “ fashionable “ DEI policies are failing….
….a ticking time bomb….just my 2C.
“Not a Boeing apologist, but the blame is mainly in the realm of maintenance, (or lack thereof).”
Was it only last year that a Muzzi mechanic at Miami airport admitted to intentionally sabotaging a jetliner?