Brake imbalance - how to rectify

My Nissan Primastar (same as Renault Traffic) van passed the Irish MOT test recently but I noticed on the Pass Statement the Service brake axle 2 imbalance is 28.67% when the maximum is 30% so it almost failed on this part of the test.

The brake effort is as follows:

Service Brake axle 2: Nearside 213KGF, Offside 298KGF

Service brake performance: 66.61%
Parking brake performance: 21.97%

Having looked at previous Pass Statements, the imbalance has increased with each DoE test.

The Nearside KGF has decreased while the offside KGF has increased - last year it was 236 and 269 respectively.

Would this suggest the rear Nearside calliper needs replacing? If not, what else could be the problem?

Thanks in advance for any advice / tips - going on a long journey soon and afraid of the calliper seizing!

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Brake imbalance - how to rectify