I need to know about verification of corrective action. I Isolated the SMB & string Checked all String VOC found out of 12 string 6 string get burnt due to a short circuit; Repaired the string after isolation.
Based on my interpretation of your text, you are describing a correction, not a corrective action. A corrective action will start when you look for the root cause of the short circuit. So, why did you have a short circuit?
After finding the root cause you should implement an action to remove that root cause. After implementing that action, you should look for a way of testing its effectiveness.