It is a Avionics LRU and has a self test function.
If AD/RAD/47 Amdt 4 is not due any engine or airframe LAME can change it and certify for it.
The ETT test (I bet they don't do at your shop anyway) is done on the bench during your repair. This test will only be due next time your RAD 47 is due and it will not be a "new unit" then.
Typical avionics shop by the sounds.