Still High Iron in my 914

I had two issues of high iron but at 812 hours.  Unfortunately, the previous owners a flight school failed to do the proper 600 gearbox inspection and we skipped a pre-buy in order to move on the deal (slight regret) which might have caught this mist-step and could have had the dealer do the inspection first.  Long story short, that 200hrs past has cost me a new set of gears, downtime and the service to remove, ship and install the gearbox  115 hrs seems low, but one never knows.