An A&P has to make a judgement call. Unluckily an A&P is held to two masters. The FAA and the customer. One can take your livelihood while the other hurts you by not using you. The FAA is much more scary. No lawyer would ever sign what A&Ps do. Depending on what it is and the time it might be seen again, the A&P decides if it needs to go or not. I can tell you that if you fly a lot, the parts get to last longer because they get checked more. A&Ps are “ parts changers “ by regulation. Considered unskilled labor by the tax system. Don’t confuse what an A&P is; the rules of the system are the rules of the system. It’s not a boat.