Lab,,
if you really want to repair that "CS phone , then :
best way to do , use FLS4S run at phoenix 4.21 TDMA to do self test , it will tell you all and real reason, why phone got "contact service", and post what is reason it problem , i will help you , and i belive , this is only way to fix it !
but if you need it to unlock that phone,, sorry
!
Willy