PROCEDURE
INSTALL AMPLIFIER MICROPHONE ASSEMBLY (w/ Microphone)
INSTALL NO. 3 HEATER CONTROL SUB-ASSEMBLY
Install the bulb.
Engage the 2 claws to install the No. 3 heater control sub-assembly.
INSTALL NO. 2 HEATER CONTROL SUB-ASSEMBLY
Install the bulb.
Engage the 2 claws to install the No. 2 heater control sub-assembly.
INSTALL NO. 1 HEATER CONTROL SUB-ASSEMBLY
Install the bulb.
Engage the 2 claws to install the No. 1 heater control sub-assembly.