FCC Regulations legally prevents work on radars and radios without proper licencing depending on what is being done. Modulator boards can generate up to 5,000 volts and it is not recommended for untrained and un licenced to be working internally in a radar. Service manuals are available to authorized dealers only but if you have relationship with one, many are willing to share and support some end user repair efforts. Parts are also sold via the dealer network so it is always good to be working with an authorized dealer. Units can be send into our repair center for repair evaluation ($145) for estimates. The evaluation fee is waived if you choose to have repairs done. If you are outside the USA, you should check your local laws. The support forum doesn't provide service manuals or details to that level here. Please contact you local dealer.