14 weeks for indicas .you have past your harvest window.your temps are 10 degreees to low. amber for sativa look for milky.most people dont know that indica doesnt truely amber .it turnes brown and degrades into less psycoactive canibinoids.
I don't need no stinkin pics to have an opinion on amber trichs, and your low temp report supports my cartoon of trich development.
I suspect that trich ambering is the result of oxidation. Lower temps would delay oxidation reaction rate.
I believe trich ambering is like so many other guides, it's just a thing that people CAN observe, so it turns into a rule.
I rarely see any ambers in my grow, and I let a White Fire go 13 weeks just to see if it would amber. Nothing. Now I chop by clock at nine weeks and love it.
Your report may be the beginning of the end for a 'wives tale'.