No error code 61 listed, only a 66 error code which indicates lamp issues:
66
A) Lamp did not turn on at P-ON sequence... Check CJ4 circuitry
B) No Lamp Inserted............... No Lamp inserted
C) Disconnected cable between ballast and lamp.... HV connection or lead wire to lamp.
D) Lamp-Enable goes to PWB-MAIN but not to Ballast....Lamp Cartridge Failure
for lamp see the following web site: http://www.shopjimmy.com/dlplamps?tv_brands_select=Mitsubishi&tv_models=Mitsubishi+WD-73638
recommend using the manufacture part# as many replacements for Mitsubishi will not work.