Just loving these thread lately .

Just to echo Nunu these bearing don't go bad easily unless there is lack of oil supply reaching the bearing. So before reassembling the engine remove the connector from the (T) that lube the bearing. Use your plane fueler (WITH A GOOD FILTER) to pump fuel into the supply line to front bearing and check for fuel lubing the front bearing. Good luck

I could be wrong but i think missing your first start & continuing to have Fail starts shorting bearing life.