d) Ensure that any telephone facilities and radio equipment (for which an OFCOM Radio Licence may be required) are maintained in a sound condition and that any defects are repaired promptly.
Glanhewch, ac os oes angen diheintiwch arwynebau’r offer sy’n dod i gysylltiad â llaeth ar ôl eu defnyddio, a’u cadw mewn cyflwr da.