Hello Siriporn san,
As per your and our experiences so far,
in case of reported failure number is too less or we find occurrence trend on manufacturing date,
as you think, manufacturing failure is suspected,
But when we say manufacturing failure, we have to provide investigation/analysis result shows manufacturing failure to CKD supply factory; Css/Sss.
They request us obvious analysis result/evidence shows manufacturing failure.
Back to this case, the analysis result is appearance check; any damage is not found on the failed parts.
GQS thinks that this result only can not show manufacturing failure.
So GQS judges that this cause is still unknown.
should you have any question, please let me know.
Thank you and best regards,