Yes, but you have to search. Check QRZ and RadioReference first. Many hams share it freely. Avoid sites that demand credit card info for a “free trial.”
The KT-7900D can be reprogrammed via the front mic connector (Kenwood-style pinout): qyt kt-7900d service manual
: If reception drops after long transmissions but returns after cooling, it may indicate a failing capacitor in the output filter. Yes, but you have to search
Parts list and ordering