I once inspected a 1928 Tudor in Boston area and found a collapsed flue-tile liner (from looking up in the clean-out at the basement). I took a photo.. and 'you need a new liner' etc. Seller had the work done, buyer hired me to 'check the new liner'.. I did the same thing.. looked up the clean-out, found a torn-apart-to-pieces (spirally) new metal liner. "you need it re-done". It was re-done. I go back, now see a good liner from clean-out, but to get to the top, it meant erecting a 21' LG and carrying up a 13' LG to make it to the top (it was actually very easy but a pain). I get to the top---the 'tube' is now just 'cut and ended above the cap/wash'.. .no 'cap' on it, etc. "Fix it right". They fix it. I go back.. same drill with the 2 ladders... this time.. a text-book job....
...and the chimney-company-owner's cell phone left up there... Oy... Four trips just to make sure this was done right...