QFA had just turned onto the 23 LLZ at 3000'. AA TWR had a VFR 'lost' over the city and heading towards final approach. QFA was maintained at 3000' and taken off the approach to the west to keep clear of the 'lost' VFR. The pilot reacted to a GPWS warning (still at 3000') and commenced a climb into the ANZ flight (at 4000') righthand downwind. TCAS then gave an RA requiring a left turn to pass behind ANZ. The reason for the GWPS remains a mystery that hopefully the investigation will resolve. Not a particularly nice experience for all involved.
TP