Sperry Marine electronic C-plath Mode X Mk1 Gryo compass annual service

The ship's captain complaint of gyro compass keep rotate in clockwise direction. Attend onboard and found as discribed by ship crew. Enter setup access code 610, checked gyrosphere current approx. 265mA and temperature approx. 72deg - very high.
Switch off the gyro compass and waited one hour for gyro sphere to settle. Remove the upper housing and found gyro liquid had evaporated quite a lot so causing the sphere overheat. Another reason for lost of gyro liquid is due to top cover cracked line whereby gyro liquid evaporate through the escaped crack line. After replaced new gyro liquid and enter access code 757 for annual service done, apply epoxy to the crack line and surrounding of the ventilation valve. Wait till epoxy dry, reinstall the gyro sphere back into housing
Started the gyro and observed the gyro sphere current approx. 267mA normal and temperature approx. 50deg, on the high side but still acceptable. Found that closing the front cover will cause the temperature to increase rapidly till 70deg.
Checked and found the fan behind the gyro housing was weak but working. Advice crew to install additional fan to cool the temperature of gyro.
After one month now, no complaint from ship crew so far, so i guess the problem had solved.
Please see attached pictures.

MX Marine / Simrad MX420 DGPS System

This is a container ship where the crew complaint that the Sperry Marine VMFT ECDIS and Radar have constantly show RAIM unsafe alarm from both DGPS no.1 and 2(MX420 with MX521 Antenna).

Go to MX Marine website and realise the following :

We have recently found that due to week rollover limitation, the date from MX421 D/GPS antenna is reset to Aug. 1, 1993. This happens when power is recycled in the unit. All other navigation information is not affected.
This week roll over issue has been fixed in the new software v4.902.
 
So follow the instruction carefully from MX521_6705.zip file to connect as follow. Download the 521-521v6705.bin into MX521A antenna via program rightarm.exe, select erase and program. After approx. 30mins of reprogramming. It shows successful on my laptop. So power down the MX521A antenna. Waited for 5mins, try to power up and reconnect all wire with Display unit MX420, found no communication between Display and Antenna. Connect back the same wire with laptop com1 setting. Found unable to reboot MX521A Antenna. This was strange as the equipment should recover by itself. For this case it was dead.
 
So finally, need to replace a new MX521A antenna with software version 6.8 and it works fine. Crew need to monitor the situation to see if the problem has fixed with the new software installed.
 
Please see attached pictures.
 
Enjoy!!