Torghabe
Can you explane a bit more "those thinks"? According with contract LH Technic is responsible for technical condition ("bad technical condition"). So, you knew, during preflight check I cant calculate all nuts, but if I dont want take the plane (due to difficulties, high oil prices, no markets, etc), I will find a lot of reason reject the plane. In this case "bad technical condition"- most winning version, especially as the plane 20 years old.