[+225 degree Fahrenheit during the day is more like it.]
You might be right, the wording of the report isn't exactly clear, but a closer reading leads me to believe that the +1360 F may be referring to the electronics temperature inside a device on the lunar surface. See below.
Still, the measured 1470F degree fluctuation is clearly due to solar radiation.
After lunar module ascent, the charged particle lunar environment experiment was commanded on at 142 hours 7 minutes and the dust cover was removed about 15 hours and 20 minutes later. Operating temperatures are nominal. The maximum temperature during lunar day is 1360 F and the minimum temperature during lunar night is minus 110 F. The instrument's operational heater cycled on automatically when the electronics temperature reached 320 F at lunar sunset, and was commanded on in the forced-on mode at 140 F, as planned.