With a switching supply change all the secondary caps, any small 50v electrolytics 9 always suspect0 and any small electrolytics near the power devices on the primary side. Works in most cases.
Just did an order to RS for a few parts, and went trawling through the 105C caps for cheap ones as stock. 100 on the way........ A few resistors as they go with the chip I ordered, so only a few cents more anyway, and a few MOV's and some tantalum caps to round things off. All local stock, so should be here Tuesday. 105 RS branded caps, and 10 Rubycon, and 10 Kemet, all in MOQ lots. All I wanted was the 10 Microchip Liion controllers to add to battery packs. Needed to get the order to a higher amount, even though RS does offer free delivery on Web orders.Surcharge on the phone, but the same online free.