Job 14:14 has been changed in the NWT 2006 printing. The changed "All the days of my compulsory service I shall wait," to "All the days of my compulsory labor I shall wait;". CO said the reason according to the writing dept is that if you're doing a service for someone it can be voluntary; you can find joy in doing so. However Job was toiling through his days, they were laborous; much like what many people go through today. They are not filled with joy, you do just what you can to get by.
Whereas when that "call" from Job 15:15 comes it will not be a laborous time, but a joyous time - when the relief comes.
He said there are other changes too. Something in 1st Thess, but he didn't remember the scripture. I'm going to try and find it.