You need to pick up the pieces of your old harmony and teach your new remote all the PS3 commands. Either that or some other remote you can teach from that take pronto hex or JP1 upgrades. The PS3 codes built into the URC aren't the same codes the logitech adapter uses. For some reason logitech has decided to make it difficult to use their adapter with a competitor's remote.
If you have a slim, you can probably control it without any adapter at all over HDMI via bravia sync, or whatever your tv maker calls their version of HDMI CEC. In that case just use the commands from your tv device. If all else fails, you can get an IR dongle from radio shack for $2 that will control everything except discrete on/off using sony blu-ray or DVD codes.