Avioniker...
This is the second forum that this topic has been posted in without much feedback from you.
What type of B737 Next Gen is it, -600/700 or -800/900??
What has been replaced??
Yes there are 2 ways to cause a bleed trip, overtemperature and overpressure, but if I may offer my 2 cents...if this isn't some kind of "gremlin", it seems more likely that it would be some kind of overpressure problem.
An actual overtemperature bleed trip means that the precooler system failed (or did its job but couldn't lower the temp) AND/OR the 450 degree thermostat failed (or did it's job).
Its would be helpful to know if the pressure gradually decreased or just shut off.