How to debug if you have difference in 2 repos that have 7-8 repo in between

 Just download all the repos and check git log or hg log 
 1st repo HD_R6201 & 2nd repo BBDR2014
the 1st repo has the bug then
check the date in between where submissions are missing in 1st repo
then goto 2nd repo check all the fixes that have been commited
if not then check all intermediate or in between repos or branches

Incase of emergency check in 1 repo above HD_R6201 that is HD_R6301
Check the exact scenario must match 

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