Layout leitura

Boa noite pessoal!

Tenho um cupom fiscal e preciso efetuar a leitura do campo com valor total que fica na Linha T3, porém a linha deste campo não é fixa, ou seja em um cupom podemos ter ´varias linhas dependendo da quantidade de itens, sendo assim a linha T3 em um determinado cupom pode estar na 4ª linha e em outro cupom a linha T3 pode estar na 15ª linha. O que devo fazer para efetuar a leitura desta linha uma vez que ela fica mundando de posição?

Modelo de um cupom em formato TXT:

202983 T01 7896229800056 0000100000000000299000000000029900000000000000000000000L00100400312010091608:36 FF00000000000000000000000000000000 0000 000 000000000000P00000000I00.00 202983000001 004000020100916 7896229800056000000000000000000000000000000000000 000001 00F 0000000000000000000000 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

202983 T01 94 0000100500000000199000000000020000000000000000000000000L00100400312010091608:36 FF00000000000000000000000000000000 0000 000 000000000000P00000000I00.00 202983000002 004000020100916 94000000000000000000000000000000000000 000001 00F 0000000000000000000000 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

202983 T01 3110 0000051600000001490000000000076900000000000000000000000L00100400312010091608:36 FF00000000000000000000000000000000 0000 000 000000000000P00000000T12.00 202983000003 004000020100916 3110000000000000000000000000000000000000 000001 00F 0000000000000000000000 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

202983 T01 7896353300194 0000100000000000299000000000029900000000000000000000000L00100400312010091608:36 FF00000000000000000000000000000000 0000 000 000000000000P00000000F00.00 202983000004 004000020100916 7896353300194000000000000000000000000000000000000 000001 00F 0000000000000000000000 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

202983 T03 0000000000000002000000000000200000000000000000000000000L00100400312010091608:36001 FF000000000000000000000001 0000 000 000000000433 00000000 202983000001 004000020100916 000000000000000000000000000000000000 00000000000000F 000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

Agradeço por qualquer ajuda.

Obrigado e fiquem com Deus