MySQL Row Based Replication, how to find failed entry in binary log?

I'm looking at moving my production systems from Statement Based Replication to Row Based Replication, but in my testing I am finding it very difficult to locate problems in the binary logs.

For example. I run a query like:

UPDATE tablename SET updateTime = NOW() where customerid = 100;

This statement updates 1000 rows. However on the slave I have removed one, so replication breaks and I get:

[ERROR] Slave SQL: Could not execute Update_rows event on table dbname.tablename; 
Can't find record in 'tablename', Error_code: 1032; 
handler error HA_ERR_KEY_NOT_FOUND; the event's master log dbmaster.010915, end_log_pos 82982844, Error_code: 1032

I then run mysqlbinlog against the binary log, and search for 82982844.

I find that in a long list like:

#161201  3:05:05 server id 21  end_log_pos 82977769     Table_map: `dbname`.`tablename` mapped to number 269238158
#161201  3:05:05 server id 21  end_log_pos 82978768     Update_rows: table id 269238158
#161201  3:05:05 server id 21  end_log_pos 82979752     Update_rows: table id 269238158
#161201  3:05:05 server id 21  end_log_pos 82980784     Update_rows: table id 269238158
#161201  3:05:05 server id 21  end_log_pos 82981808     Update_rows: table id 269238158
#161201  3:05:05 server id 21  end_log_pos 82982844     Update_rows: table id 269238158
#161201  3:05:05 server id 21  end_log_pos 82983872     Update_rows: table id 269238158
#161201  3:05:05 server id 21  end_log_pos 82984904     Update_rows: table id 269238158

which is followed by a whole load of:

### UPDATE `dbname`.`tablename`
### WHERE
###   @1=1
###   @2=2
###   @3=3
###   @4=4
###   @5='abcdef'
###   @6=2016-12-01 09:00:16
### SET
###   @1=1
###   @2=2
###   @3=3
###   @4=4
###   @5='abcdef'
###   @6=2016-12-01 10:01:08

Bear in mind that there is apx 1000 entries in the first section, and apx 1000 entries in the second section, how do I identify which row was missing?

Is there perhaps a better tool than mysqlbinlog to help in these situations?