Per Van's request. I will just offer snips, not entire verses. For the 1984 NIV I will put 84. For the 2011 NIV I will put 11.
1 Timothy 6:2
84 : they are brothers
11 : they are fellow believers
Here is an excellent NT example of thoughtful translation. This choice expands the message beyond male slave holders, to present the idea we should not use our relationship with our siblings in Christ, for special favor.
My only comment would be to wonder whether this choice is superior to changing "brothers" to "brothers and sisters" when siblings in Christ are in view.