Took my audi into dealer to have the heater core replaced, when I got it back the top would not unlatch. Took the car back to dealer and they said the left latch was broken and would need to replace the entire latching assembly for $1200.00 USD. The latch worked fine prior to disassembling the car to replace the heater core. My feeling is the latch is not broken but something is not connected right. Any opinions you might have would be helpful. Thanks.