Read:
T G C 
C T G 
G C T 
Data transmission fine...

Read:
T G C 
A C C 
T G A 
Check code error at position (2, 1)

Read:
T T A 
G T G 
C T G 
Error in pos: (1,1) ... corrected, new code:
T T A 
G A G 
C T G 

Read:
A T T 
C G T 
C T A 
Check code error at position (2, 1)

Read:
T C G 
G G A 
C T G 
Data transmission fine...

Read:
A T A 
G C T 
G G A 
Check code error at position (0, 2)

Read:
C G T 
A T T 
C T A 
Check code error at position (2, 1)

Read:
A A A 
C C T 
C G T 
Error in pos: (1,1) ... corrected, new code:
A A A 
C G T 
C G T