Thank you for sharing this pilot study on cold chain equipment failures. I would like to share my experience on how faulty absorption type vaccine refrigerators and freezers were restored to its normal cooling performance. Based on my experience of conducting hands-on-training in many countries on repair and maintenance of absorption type vaccine refrigerators namely: RCW 50 EG, RCW 42 EG, FCW 20 EG and SIBIR GE we have not encountered a cooling-unit problem on absorption type vaccine refrigerators and freezers. An absorption vaccine refrigerator is a combination of 3 major components namely: the refrigeration system which is the cooling-unit, the power source system which is the lpg circuit, and the cabinet system which is the enclosure. All of the 3 major system components can be separated from each other and can also be assembled together. Please refer to photos in the attachment. The cause of the non-cooling absorption units that were checked and diagnosed was mainly in the power source system either by any or combination of the following: • Blocked or clogged nozzle • Dirty or deformed burner • Defective thermocouple • Defective safety pilot and thermostat assembly During the training, the participants were able to diagnose, service and restore the cooling performance of the non-cooling absorption units that were brought to the training venue. After the training, the trainees had successfully serviced other non-cooling absorption units in their respective area using the set of tools provided to them. Based on experience, local staff can be trained to maintain and service their non-cooling absorption units. This is one viable, cost-effective and sustainable option to sustain EPI activities considering budget limitations and SDD replacement still in progress. Hope this helps. Alejo Bejemino Cold Chain Equipment and Vaccine Management Consultant