C# (Visual C# Interactive Compiler), 92 bytes

s=>(s=string.Concat(s.Select(c=>Convert.ToString(c,2).PadLeft(7,'0')))).Zip(2+s,(x,y)=>x!=y)

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Alternative solution with the same number of bytes...

s=>(s=s.SelectMany(c=>Convert.ToString(c,2).PadLeft(7,'0'))).Zip(s.Prepend('2'),(x,y)=>x!=y)

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C# (Visual C# Interactive Compiler), 80 bytes

s=>{for(int p,c=2,i=0;i<7*s.Length;Write(p==c?0:1))(p,c)=(c,1&s[i/7]>>6-i++%7);}

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C# (Visual C# Interactive Compiler), 92 bytes

s=>(s=string.Concat(s.Select(c=>Convert.ToString(c,2).PadLeft(7,'0')))).Zip(2+s,(x,y)=>x!=y)

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C# (Visual C# Interactive Compiler), 92 bytes

s=>(s=string.Concat(s.Select(c=>Convert.ToString(c,2).PadLeft(7,'0')))).Zip(2+s,(x,y)=>x!=y)

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Alternative solution with the same number of bytes...

s=>(s=s.SelectMany(c=>Convert.ToString(c,2).PadLeft(7,'0'))).Zip(s.Prepend('2'),(x,y)=>x!=y)

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C# (Visual C# Interactive Compiler), 52 bytes

s=>string.Concat(s.Select(c=>Convert.ToString(c,2)))

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C# (Visual C# Interactive Compiler), 92 bytes

s=>(s=string.Concat(s.Select(c=>Convert.ToString(c,2).PadLeft(7,'0')))).Zip(2+s,(x,y)=>x!=y)

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