any updates on the batt replacement? I also have the same problem. I already opened the front panel but cannot find any batt.
finally, after several months of inconvenience having to do the setup everytime i turn on my h/k 5550, i had my avr memory problems addressed. i already brought my unit to beyond innovations to have it serviced. if anyone would like to have their unit repaired for the same problem, cost would probably be less than P2,500. service charge kasi is P1,500 then add the spare part na lang. i had the power supply repaired din kasi so i don't know the exact amount just for the memory repair, but it shouldn't be more than P2,500. workmanship seems ok too. di naman kumalat mga wires sa loob or kinulang ng turnilyo pagkabalik.
location is just behind eastwood. in fact, dun sa street nila ang tumbok eh yung entrance to eastwood sa likod. coming from ortigas take the turn on the street just after monark (and before eastwood). me makita kayo malaki building sa left, turn left din. then sa 2nd gate on your left also, pagtanong nyo na lang saan repair shop ng JBL.