4 power caps on a new Lennox ? I guess it's possible but highly unlikely. Ive changed maybe 4 power caps in 10 years and I think 2 TXVs.
And to come across a new unit with all 4 valves bad ??
Its almost never the TXVs and the power caps I condemned lost their charge due to the cap rubbing on part of the machine.
Restrictions are caught in the driers 99% of the time and too many good TXVs get tossed because of bad driers or airflow issues or some other tech has adjusted them out incorrectly.
You might want to check that too if they're adjustable but that would mean another tech before you monkeyed with all four valves.