I'm not using a 3550 but rather a 3560 switch and the only big difference that I see is that you have VLAN 236 as your native (untagged) VLAN on that interface. I would actually take that off and have all VLAN's be tagged to PF. Otherwise PF will most likely try to talk on the untagged VLAN. You will obviously need to change the LAN interface on PF to be tagged with VLAN 236 to accomplish this.
Curtis
