Seems there is no way, except putting your switch to colder area. In your case, it looks like tigger is sfp+ module. Can you try to cool down somehow this module?
Also is strange my CPU is on 58C and fans are on 0 RPM, but I'm still on ROS6.
> /system health print
cpu-temperature: 58C
power-consumption: 8.5W
board-temperature1: 30C
psu1-voltage: 26.4V
psu2-voltage: 52.6V
psu1-current: 0A
psu2-current: 0.1A
fan1-speed: 0RPM
fan2-speed: 0RPM
fan3-speed: 0RPM
fan4-speed: 0RPM
> /system routerboard print
routerboard: yes
model: CRS328-24P-4S+
revision: r2
serial-number: XXXXX
firmware-type: dx3230L
factory-firmware: 6.47.6
current-firmware: 6.48.6
upgrade-firmware: 6.48.6